Package Instance
Lookup for vulnerable packages by Package URL.
GET /api/packages/155111?format=api
{ "url": "http://public2.vulnerablecode.io/api/packages/155111?format=api", "purl": "pkg:rpm/redhat/jbcs-httpd24-httpd@2.4.23-120.jbcs?arch=el6", "type": "rpm", "namespace": "redhat", "name": "jbcs-httpd24-httpd", "version": "2.4.23-120.jbcs", "qualifiers": { "arch": "el6" }, "subpath": "", "is_vulnerable": true, "next_non_vulnerable_version": null, "latest_non_vulnerable_version": null, "affected_by_vulnerabilities": [ { "url": "http://public2.vulnerablecode.io/api/vulnerabilities/51063?format=api", "vulnerability_id": "VCID-29w7-shcm-cked", "summary": "The HTTP/2 protocol implementation (mod_http2) had an incomplete handling of the LimitRequestFields directive. This allowed an attacker to inject unlimited request headers into the server, leading to eventual memory exhaustion.", "references": [ { "reference_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-8740.json", "reference_id": "", "reference_type": "", "scores": [ { "value": "5.9", "scoring_system": "cvssv3", "scoring_elements": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H" } ], "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-8740.json" }, { "reference_url": "https://api.first.org/data/v1/epss?cve=CVE-2016-8740", "reference_id": "", "reference_type": "", "scores": [ { "value": "0.71517", "scoring_system": "epss", "scoring_elements": "0.98747", "published_at": "2026-06-05T12:55:00Z" }, { "value": "0.7201", "scoring_system": "epss", "scoring_elements": "0.98767", "published_at": "2026-06-06T12:55:00Z" }, { "value": "0.7201", "scoring_system": "epss", "scoring_elements": "0.98766", "published_at": "2026-06-07T12:55:00Z" } ], "url": "https://api.first.org/data/v1/epss?cve=CVE-2016-8740" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8740", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8740" }, { "reference_url": "https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml", "reference_id": "", "reference_type": "", "scores": [ { "value": "4.3", "scoring_system": "cvssv2", "scoring_elements": "AV:N/AC:M/Au:N/C:N/I:N/A:P" } ], "url": "https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml" }, { "reference_url": "https://bugzilla.redhat.com/show_bug.cgi?id=1401528", "reference_id": "1401528", "reference_type": "", "scores": [], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1401528" }, { "reference_url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=847124", "reference_id": "847124", "reference_type": "", "scores": [], "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=847124" }, { "reference_url": "https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/linux/dos/40909.py", "reference_id": "CVE-2016-8740", "reference_type": "exploit", "scores": [], "url": "https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/linux/dos/40909.py" }, { "reference_url": "https://httpd.apache.org/security/json/CVE-2016-8740.json", "reference_id": "CVE-2016-8740", "reference_type": "", "scores": [ { "value": "low", "scoring_system": "apache_httpd", "scoring_elements": "" } ], "url": "https://httpd.apache.org/security/json/CVE-2016-8740.json" }, { "reference_url": "https://security.gentoo.org/glsa/201701-36", "reference_id": "GLSA-201701-36", "reference_type": "", "scores": [], "url": "https://security.gentoo.org/glsa/201701-36" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1161", "reference_id": "RHSA-2017:1161", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1161" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1413", "reference_id": "RHSA-2017:1413", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1413" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1414", "reference_id": "RHSA-2017:1414", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1414" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1415", "reference_id": "RHSA-2017:1415", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1415" } ], "fixed_packages": [], "aliases": [ "CVE-2016-8740" ], "risk_score": 10.0, "exploitability": "2.0", "weighted_severity": "5.3", "resource_url": "http://public2.vulnerablecode.io/vulnerabilities/VCID-29w7-shcm-cked" }, { "url": "http://public2.vulnerablecode.io/api/vulnerabilities/6777?format=api", "vulnerability_id": "VCID-4wy2-zsz2-a3ew", "summary": "multiple issues", "references": [ { "reference_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-6304.json", "reference_id": "", "reference_type": "", "scores": [ { "value": "7.5", "scoring_system": "cvssv3", "scoring_elements": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H" } ], "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-6304.json" }, { "reference_url": "https://api.first.org/data/v1/epss?cve=CVE-2016-6304", "reference_id": "", "reference_type": "", "scores": [ { "value": "0.28075", "scoring_system": "epss", "scoring_elements": "0.96569", "published_at": "2026-06-05T12:55:00Z" }, { "value": "0.28075", "scoring_system": "epss", "scoring_elements": "0.96575", "published_at": "2026-06-07T12:55:00Z" }, { "value": "0.28075", "scoring_system": "epss", "scoring_elements": "0.96566", "published_at": "2026-06-04T12:55:00Z" }, { "value": "0.28075", "scoring_system": "epss", "scoring_elements": "0.96574", "published_at": "2026-06-06T12:55:00Z" } ], "url": "https://api.first.org/data/v1/epss?cve=CVE-2016-6304" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2177", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2177" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2178", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2178" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2179", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2179" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2180", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2180" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2181", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2181" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2182", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2182" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6302", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6302" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6303", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6303" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6304", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6304" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6306", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6306" }, { "reference_url": "https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml", "reference_id": "", "reference_type": "", "scores": [ { "value": "5", "scoring_system": "cvssv2", "scoring_elements": "AV:N/AC:L/Au:N/C:N/I:N/A:P" } ], "url": "https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml" }, { "reference_url": "https://bugzilla.redhat.com/show_bug.cgi?id=1377600", "reference_id": "1377600", "reference_type": "", "scores": [], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1377600" }, { "reference_url": "https://security.archlinux.org/ASA-201609-23", "reference_id": "ASA-201609-23", "reference_type": "", "scores": [], "url": "https://security.archlinux.org/ASA-201609-23" }, { "reference_url": "https://security.archlinux.org/ASA-201609-24", "reference_id": "ASA-201609-24", "reference_type": "", "scores": [], "url": "https://security.archlinux.org/ASA-201609-24" }, { "reference_url": "https://security.archlinux.org/AVG-29", "reference_id": "AVG-29", "reference_type": "", "scores": [ { "value": "High", "scoring_system": "archlinux", "scoring_elements": "" } ], "url": "https://security.archlinux.org/AVG-29" }, { "reference_url": "https://security.archlinux.org/AVG-30", "reference_id": "AVG-30", "reference_type": "", "scores": [ { "value": "High", "scoring_system": "archlinux", "scoring_elements": "" } ], "url": "https://security.archlinux.org/AVG-30" }, { "reference_url": "https://security.gentoo.org/glsa/201612-16", "reference_id": "GLSA-201612-16", "reference_type": "", "scores": [], "url": "https://security.gentoo.org/glsa/201612-16" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2016:1940", "reference_id": "RHSA-2016:1940", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2016:1940" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2016:2802", "reference_id": "RHSA-2016:2802", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2016:2802" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1413", "reference_id": "RHSA-2017:1413", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1413" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1414", "reference_id": "RHSA-2017:1414", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1414" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1415", "reference_id": "RHSA-2017:1415", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1415" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1658", "reference_id": "RHSA-2017:1658", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1658" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1659", "reference_id": "RHSA-2017:1659", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1659" }, { "reference_url": "https://usn.ubuntu.com/3087-1/", "reference_id": "USN-3087-1", "reference_type": "", "scores": [], "url": "https://usn.ubuntu.com/3087-1/" } ], "fixed_packages": [], "aliases": [ "CVE-2016-6304" ], "risk_score": 4.0, "exploitability": "0.5", "weighted_severity": "8.0", "resource_url": "http://public2.vulnerablecode.io/vulnerabilities/VCID-4wy2-zsz2-a3ew" }, { "url": "http://public2.vulnerablecode.io/api/vulnerabilities/51059?format=api", "vulnerability_id": "VCID-aj4u-27vr-9ugt", "summary": "Malicious input to mod_auth_digest will cause the server to crash, and each instance continues to crash even for subsequently valid requests.", "references": [ { "reference_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-2161.json", "reference_id": "", "reference_type": "", "scores": [ { "value": "7.5", "scoring_system": "cvssv3", "scoring_elements": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H" } ], "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-2161.json" }, { "reference_url": "https://api.first.org/data/v1/epss?cve=CVE-2016-2161", "reference_id": "", "reference_type": "", "scores": [ { "value": "0.25822", "scoring_system": "epss", "scoring_elements": "0.9637", "published_at": "2026-06-06T12:55:00Z" }, { "value": "0.25822", "scoring_system": "epss", "scoring_elements": "0.96361", "published_at": "2026-06-04T12:55:00Z" }, { "value": "0.25822", "scoring_system": "epss", "scoring_elements": "0.96371", "published_at": "2026-06-07T12:55:00Z" }, { "value": "0.25822", "scoring_system": "epss", "scoring_elements": "0.96366", "published_at": "2026-06-05T12:55:00Z" } ], "url": "https://api.first.org/data/v1/epss?cve=CVE-2016-2161" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-0736", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-0736" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2161", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2161" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8743", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8743" }, { "reference_url": "https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml", "reference_id": "", "reference_type": "", "scores": [ { "value": "4.3", "scoring_system": "cvssv2", "scoring_elements": "AV:N/AC:M/Au:N/C:N/I:N/A:P" } ], "url": "https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml" }, { "reference_url": "https://bugzilla.redhat.com/show_bug.cgi?id=1406753", "reference_id": "1406753", "reference_type": "", "scores": [], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1406753" }, { "reference_url": "https://httpd.apache.org/security/json/CVE-2016-2161.json", "reference_id": "CVE-2016-2161", "reference_type": "", "scores": [ { "value": "low", "scoring_system": "apache_httpd", "scoring_elements": "" } ], "url": "https://httpd.apache.org/security/json/CVE-2016-2161.json" }, { "reference_url": "https://security.gentoo.org/glsa/201701-36", "reference_id": "GLSA-201701-36", "reference_type": "", "scores": [], "url": "https://security.gentoo.org/glsa/201701-36" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:0906", "reference_id": "RHSA-2017:0906", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:0906" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1161", "reference_id": "RHSA-2017:1161", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1161" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1413", "reference_id": "RHSA-2017:1413", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1413" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1414", "reference_id": "RHSA-2017:1414", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1414" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1415", "reference_id": "RHSA-2017:1415", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1415" }, { "reference_url": "https://usn.ubuntu.com/3279-1/", "reference_id": "USN-3279-1", "reference_type": "", "scores": [], "url": "https://usn.ubuntu.com/3279-1/" } ], "fixed_packages": [], "aliases": [ "CVE-2016-2161" ], "risk_score": 3.4, "exploitability": "0.5", "weighted_severity": "6.8", "resource_url": "http://public2.vulnerablecode.io/vulnerabilities/VCID-aj4u-27vr-9ugt" }, { "url": "http://public2.vulnerablecode.io/api/vulnerabilities/97174?format=api", "vulnerability_id": "VCID-n74y-fd83-ybem", "summary": "A denial of service flaw was found in OpenSSL 0.9.8, 1.0.1, 1.0.2 through 1.0.2h, and 1.1.0 in the way the TLS/SSL protocol defined processing of ALERT packets during a connection handshake. A remote attacker could use this flaw to make a TLS/SSL server consume an excessive amount of CPU and fail to accept connections from other clients.", "references": [ { "reference_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-8610.json", "reference_id": "", "reference_type": "", "scores": [ { "value": "7.5", "scoring_system": "cvssv3", "scoring_elements": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H" } ], "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-8610.json" }, { "reference_url": "https://api.first.org/data/v1/epss?cve=CVE-2016-8610", "reference_id": "", "reference_type": "", "scores": [ { "value": "0.71356", "scoring_system": "epss", "scoring_elements": "0.98738", "published_at": "2026-06-06T12:55:00Z" }, { "value": "0.71356", "scoring_system": "epss", "scoring_elements": "0.98739", "published_at": "2026-06-07T12:55:00Z" } ], "url": "https://api.first.org/data/v1/epss?cve=CVE-2016-8610" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7056", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7056" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8610", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8610" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-3731", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-3731" }, { "reference_url": "https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml", "reference_id": "", "reference_type": "", "scores": [ { "value": "4.3", "scoring_system": "cvssv2", "scoring_elements": "AV:N/AC:M/Au:N/C:N/I:N/A:P" }, { "value": "7.5", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H" } ], "url": "https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml" }, { "reference_url": "https://bugzilla.redhat.com/show_bug.cgi?id=1384743", "reference_id": "1384743", "reference_type": "", "scores": [], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1384743" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:0286", "reference_id": "RHSA-2017:0286", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:0286" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:0574", "reference_id": "RHSA-2017:0574", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:0574" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1413", "reference_id": "RHSA-2017:1413", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1413" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1414", "reference_id": "RHSA-2017:1414", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1414" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1415", "reference_id": "RHSA-2017:1415", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1415" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1658", "reference_id": "RHSA-2017:1658", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1658" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1659", "reference_id": "RHSA-2017:1659", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1659" }, { "reference_url": "https://usn.ubuntu.com/3181-1/", "reference_id": "USN-3181-1", "reference_type": "", "scores": [], "url": "https://usn.ubuntu.com/3181-1/" }, { "reference_url": "https://usn.ubuntu.com/3183-1/", "reference_id": "USN-3183-1", "reference_type": "", "scores": [], "url": "https://usn.ubuntu.com/3183-1/" }, { "reference_url": "https://usn.ubuntu.com/3183-2/", "reference_id": "USN-3183-2", "reference_type": "", "scores": [], "url": "https://usn.ubuntu.com/3183-2/" } ], "fixed_packages": [], "aliases": [ "CVE-2016-8610" ], "risk_score": 3.4, "exploitability": "0.5", "weighted_severity": "6.8", "resource_url": "http://public2.vulnerablecode.io/vulnerabilities/VCID-n74y-fd83-ybem" }, { "url": "http://public2.vulnerablecode.io/api/vulnerabilities/51064?format=api", "vulnerability_id": "VCID-nn89-pb36-v7ds", "summary": "Apache HTTP Server, prior to release 2.4.25 (and 2.2.32), accepted a broad pattern of unusual whitespace patterns from the user-agent, including bare CR, FF, VTAB in parsing the request line and request header lines, as well as HTAB in parsing the request line. Any bare CR present in request lines was treated as whitespace and remained in the request field member \"the_request\", while a bare CR in the request header field name would be honored as whitespace, and a bare CR in the request header field value was retained the input headers array. Implied additional whitespace was accepted in the request line and prior to the ':' delimiter of any request header lines.\nRFC7230 Section 3.5 calls out some of these whitespace exceptions, and section 3.2.3 eliminated and clarified the role of implied whitespace in the grammer of this specification. Section 3.1.1 requires exactly one single SP between the method and request-target, and between the request-target and HTTP-version, followed immediately by a CRLF sequence. None of these fields permit any (unencoded) CTL character whatsoever. Section 3.2.4 explicitly disallowed any whitespace from the request header field prior to the ':' character, while Section 3.2 disallows all CTL characters in the request header line other than the HTAB character as whitespace.\nThese defects represent a security concern when httpd is participating in any chain of proxies or interacting with back-end application servers, either through mod_proxy or using conventional CGI mechanisms. In each case where one agent accepts such CTL characters and does not treat them as whitespace, there is the possiblity in a proxy chain of generating two responses from a server behind the uncautious proxy agent. In a sequence of two requests, this results in request A to the first proxy being interpreted as requests A + A' by the backend server, and if requests A and B were submitted to the first proxy in a keepalive connection, the proxy may interpret response A' as the response to request B, polluting the cache or potentially serving the A' content to a different downstream user-agent.\nThese defects are addressed with the release of Apache HTTP Server 2.4.25 and coordinated by a new directive; HttpProtocolOptions Strict which is the default behavior of 2.4.25 and later.\nBy toggling from 'Strict' behavior to 'Unsafe' behavior, some of the restrictions may be relaxed to allow some invalid HTTP/1.1 clients to communicate with the server, but this will reintroduce the possibility of the problems described in this assessment. Note that relaxing the behavior to 'Unsafe' will still not permit raw CTLs other than HTAB (where permitted), but will allow other RFC requirements to not be enforced, such as exactly two SP characters in the request line.", "references": [ { "reference_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-8743.json", "reference_id": "", "reference_type": "", "scores": [ { "value": "4.0", "scoring_system": "cvssv3", "scoring_elements": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N" } ], "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-8743.json" }, { "reference_url": "https://api.first.org/data/v1/epss?cve=CVE-2016-8743", "reference_id": "", "reference_type": "", "scores": [ { "value": "0.0978", "scoring_system": "epss", "scoring_elements": "0.9311", "published_at": "2026-06-06T12:55:00Z" }, { "value": "0.0978", "scoring_system": "epss", "scoring_elements": "0.931", "published_at": "2026-06-04T12:55:00Z" }, { "value": "0.0978", "scoring_system": "epss", "scoring_elements": "0.93107", "published_at": "2026-06-07T12:55:00Z" }, { "value": "0.0978", "scoring_system": "epss", "scoring_elements": "0.93111", "published_at": "2026-06-05T12:55:00Z" } ], "url": "https://api.first.org/data/v1/epss?cve=CVE-2016-8743" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-0736", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-0736" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2161", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2161" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8743", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8743" }, { "reference_url": "https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml", "reference_id": "", "reference_type": "", "scores": [ { "value": "5.8", "scoring_system": "cvssv2", "scoring_elements": "AV:N/AC:M/Au:N/C:P/I:P/A:N" } ], "url": "https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml" }, { "reference_url": "https://bugzilla.redhat.com/show_bug.cgi?id=1406822", "reference_id": "1406822", "reference_type": "", "scores": [], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1406822" }, { "reference_url": "https://httpd.apache.org/security/json/CVE-2016-8743.json", "reference_id": "CVE-2016-8743", "reference_type": "", "scores": [ { "value": "important", "scoring_system": "apache_httpd", "scoring_elements": "" } ], "url": "https://httpd.apache.org/security/json/CVE-2016-8743.json" }, { "reference_url": "https://security.gentoo.org/glsa/201701-36", "reference_id": "GLSA-201701-36", "reference_type": "", "scores": [], "url": "https://security.gentoo.org/glsa/201701-36" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:0906", "reference_id": "RHSA-2017:0906", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:0906" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1161", "reference_id": "RHSA-2017:1161", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1161" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1413", "reference_id": "RHSA-2017:1413", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1413" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1414", "reference_id": "RHSA-2017:1414", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1414" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1415", "reference_id": "RHSA-2017:1415", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1415" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1721", "reference_id": "RHSA-2017:1721", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1721" }, { "reference_url": "https://usn.ubuntu.com/3279-1/", "reference_id": "USN-3279-1", "reference_type": "", "scores": [], "url": "https://usn.ubuntu.com/3279-1/" }, { "reference_url": "https://usn.ubuntu.com/3373-1/", "reference_id": "USN-3373-1", "reference_type": "", "scores": [], "url": "https://usn.ubuntu.com/3373-1/" } ], "fixed_packages": [], "aliases": [ "CVE-2016-8743" ], "risk_score": 3.1, "exploitability": "0.5", "weighted_severity": "6.2", "resource_url": "http://public2.vulnerablecode.io/vulnerabilities/VCID-nn89-pb36-v7ds" }, { "url": "http://public2.vulnerablecode.io/api/vulnerabilities/51057?format=api", "vulnerability_id": "VCID-nyqj-yfjw-23dd", "summary": "Prior to Apache HTTP release 2.4.25, mod_sessioncrypto was encrypting its data/cookie using the configured ciphers with possibly either CBC or ECB modes of operation (AES256-CBC by default), hence no selectable or builtin authenticated encryption. This made it vulnerable to padding oracle attacks, particularly with CBC. An authentication tag (SipHash MAC) is now added to prevent such attacks.", "references": [ { "reference_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-0736.json", "reference_id": "", "reference_type": "", "scores": [ { "value": "5.4", "scoring_system": "cvssv3", "scoring_elements": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N" } ], "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-0736.json" }, { "reference_url": "https://api.first.org/data/v1/epss?cve=CVE-2016-0736", "reference_id": "", "reference_type": "", "scores": [ { "value": "0.4168", "scoring_system": "epss", "scoring_elements": "0.97492", "published_at": "2026-06-04T12:55:00Z" }, { "value": "0.4168", "scoring_system": "epss", "scoring_elements": "0.97498", "published_at": "2026-06-05T12:55:00Z" }, { "value": "0.4168", "scoring_system": "epss", "scoring_elements": "0.97499", "published_at": "2026-06-07T12:55:00Z" } ], "url": "https://api.first.org/data/v1/epss?cve=CVE-2016-0736" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-0736", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-0736" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2161", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2161" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8743", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8743" }, { "reference_url": "https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml", "reference_id": "", "reference_type": "", "scores": [ { "value": "4", "scoring_system": "cvssv2", "scoring_elements": "AV:N/AC:H/Au:N/C:P/I:P/A:N" } ], "url": "https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml" }, { "reference_url": "https://bugzilla.redhat.com/show_bug.cgi?id=1406744", "reference_id": "1406744", "reference_type": "", "scores": [], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1406744" }, { "reference_url": "https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/multiple/webapps/40961.py", "reference_id": "CVE-2016-0736", "reference_type": "exploit", "scores": [], "url": "https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/multiple/webapps/40961.py" }, { "reference_url": "https://httpd.apache.org/security/json/CVE-2016-0736.json", "reference_id": "CVE-2016-0736", "reference_type": "", "scores": [ { "value": "low", "scoring_system": "apache_httpd", "scoring_elements": "" } ], "url": "https://httpd.apache.org/security/json/CVE-2016-0736.json" }, { "reference_url": "https://www.redteam-pentesting.de/advisories/rt-sa-2016-001.txt", "reference_id": "CVE-2016-0736", "reference_type": "exploit", "scores": [], "url": "https://www.redteam-pentesting.de/advisories/rt-sa-2016-001.txt" }, { "reference_url": "https://security.gentoo.org/glsa/201701-36", "reference_id": "GLSA-201701-36", "reference_type": "", "scores": [], "url": "https://security.gentoo.org/glsa/201701-36" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:0906", "reference_id": "RHSA-2017:0906", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:0906" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1161", "reference_id": "RHSA-2017:1161", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1161" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1413", "reference_id": "RHSA-2017:1413", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1413" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1414", "reference_id": "RHSA-2017:1414", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1414" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1415", "reference_id": "RHSA-2017:1415", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1415" }, { "reference_url": "https://usn.ubuntu.com/3279-1/", "reference_id": "USN-3279-1", "reference_type": "", "scores": [], "url": "https://usn.ubuntu.com/3279-1/" } ], "fixed_packages": [], "aliases": [ "CVE-2016-0736" ], "risk_score": 9.8, "exploitability": "2.0", "weighted_severity": "4.9", "resource_url": "http://public2.vulnerablecode.io/vulnerabilities/VCID-nyqj-yfjw-23dd" }, { "url": "http://public2.vulnerablecode.io/api/vulnerabilities/97173?format=api", "vulnerability_id": "VCID-xpn8-u26e-77ge", "summary": "A timing attack flaw was found in OpenSSL 1.0.1u and before that could allow a malicious user with local access to recover ECDSA P-256 private keys.", "references": [ { "reference_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-7056.json", "reference_id": "", "reference_type": "", "scores": [ { "value": "5.5", "scoring_system": "cvssv3", "scoring_elements": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N" } ], "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-7056.json" }, { "reference_url": "https://api.first.org/data/v1/epss?cve=CVE-2016-7056", "reference_id": "", "reference_type": "", "scores": [ { "value": "0.00176", "scoring_system": "epss", "scoring_elements": "0.38884", "published_at": "2026-06-07T12:55:00Z" }, { "value": "0.00176", "scoring_system": "epss", "scoring_elements": "0.38821", "published_at": "2026-06-04T12:55:00Z" }, { "value": "0.00176", "scoring_system": "epss", "scoring_elements": "0.38909", "published_at": "2026-06-05T12:55:00Z" }, { "value": "0.00176", "scoring_system": "epss", "scoring_elements": "0.38912", "published_at": "2026-06-06T12:55:00Z" } ], "url": "https://api.first.org/data/v1/epss?cve=CVE-2016-7056" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7056", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7056" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8610", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8610" }, { "reference_url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-3731", "reference_id": "", "reference_type": "", "scores": [], "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-3731" }, { "reference_url": "https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml", "reference_id": "", "reference_type": "", "scores": [ { "value": "4.9", "scoring_system": "cvssv2", "scoring_elements": "AV:L/AC:L/Au:N/C:C/I:N/A:N" } ], "url": "https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml" }, { "reference_url": "https://bugzilla.redhat.com/show_bug.cgi?id=1412120", "reference_id": "1412120", "reference_type": "", "scores": [], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1412120" }, { "reference_url": "https://security.archlinux.org/AVG-140", "reference_id": "AVG-140", "reference_type": "", "scores": [ { "value": "Medium", "scoring_system": "archlinux", "scoring_elements": "" } ], "url": "https://security.archlinux.org/AVG-140" }, { "reference_url": "https://security.archlinux.org/AVG-141", "reference_id": "AVG-141", "reference_type": "", "scores": [ { "value": "Medium", "scoring_system": "archlinux", "scoring_elements": "" } ], "url": "https://security.archlinux.org/AVG-141" }, { "reference_url": "https://access.redhat.com/errata/RHSA-2017:1413", "reference_id": "RHSA-2017:1413", "reference_type": "", "scores": [], "url": "https://access.redhat.com/errata/RHSA-2017:1413" }, { "reference_url": 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