{"url":"http://public2.vulnerablecode.io/api/packages/564?format=json","purl":"pkg:apache/httpd@2.4.47","type":"apache","namespace":"","name":"httpd","version":"2.4.47","qualifiers":{},"subpath":"","is_vulnerable":true,"next_non_vulnerable_version":"2.4.54","latest_non_vulnerable_version":"2.4.54","affected_by_vulnerabilities":[{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/3815?format=json","vulnerability_id":"VCID-6b7y-562y-suce","summary":"Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the size limitations as configured for the server and used for the HTTP/1 protocol as well. On violation of these restrictions and HTTP response is sent to the client with a status code indicating why the request was rejected.\n\nThis rejection response was not fully initialised in the HTTP/2 protocol handler if the offending header was the very first one received or appeared in a a footer. This led to a NULL pointer dereference on initialised memory, crashing reliably the child process. Since such a triggering HTTP/2 request is easy to craft and submit, this can be exploited to DoS the server.\n\nThis issue affected  mod_http2 1.15.17 and Apache HTTP Server version 2.4.47 only. Apache HTTP Server 2.4.47 was never released.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-31618.json","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/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-2021-31618.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-31618","reference_id":"","reference_type":"","scores":[{"value":"0.11001","scoring_system":"epss","scoring_elements":"0.93424","published_at":"2026-04-12T12:55:00Z"},{"value":"0.11001","scoring_system":"epss","scoring_elements":"0.934","published_at":"2026-04-02T12:55:00Z"},{"value":"0.11001","scoring_system":"epss","scoring_elements":"0.93416","published_at":"2026-04-08T12:55:00Z"},{"value":"0.11001","scoring_system":"epss","scoring_elements":"0.93392","published_at":"2026-04-01T12:55:00Z"},{"value":"0.11001","scoring_system":"epss","scoring_elements":"0.93408","published_at":"2026-04-07T12:55:00Z"},{"value":"0.11001","scoring_system":"epss","scoring_elements":"0.93425","published_at":"2026-04-13T12:55:00Z"},{"value":"0.11001","scoring_system":"epss","scoring_elements":"0.93419","published_at":"2026-04-09T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-31618"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-35452","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-35452"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26690","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26690"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26691","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26691"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30641","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30641"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-31618","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-31618"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"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=1968013","reference_id":"1968013","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1968013"},{"reference_url":"http://www.openwall.com/lists/oss-security/2024/03/13/2","reference_id":"2","reference_type":"","scores":[{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-05-20T16:18:33Z/"}],"url":"http://www.openwall.com/lists/oss-security/2024/03/13/2"},{"reference_url":"https://seclists.org/oss-sec/2021/q2/206","reference_id":"206","reference_type":"","scores":[{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-05-20T16:18:33Z/"}],"url":"https://seclists.org/oss-sec/2021/q2/206"},{"reference_url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2NKJ3ZA3FTSZ2QBBPKS6BYGAWYRABNQQ/","reference_id":"2NKJ3ZA3FTSZ2QBBPKS6BYGAWYRABNQQ","reference_type":"","scores":[{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-05-20T16:18:33Z/"}],"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2NKJ3ZA3FTSZ2QBBPKS6BYGAWYRABNQQ/"},{"reference_url":"http://www.openwall.com/lists/oss-security/2021/06/10/9","reference_id":"9","reference_type":"","scores":[{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-05-20T16:18:33Z/"}],"url":"http://www.openwall.com/lists/oss-security/2021/06/10/9"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=989562","reference_id":"989562","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=989562"},{"reference_url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A73QJ4HPUMU26I6EULG6SCK67TUEXZYR/","reference_id":"A73QJ4HPUMU26I6EULG6SCK67TUEXZYR","reference_type":"","scores":[{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-05-20T16:18:33Z/"}],"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A73QJ4HPUMU26I6EULG6SCK67TUEXZYR/"},{"reference_url":"https://security.archlinux.org/ASA-202106-23","reference_id":"ASA-202106-23","reference_type":"","scores":[],"url":"https://security.archlinux.org/ASA-202106-23"},{"reference_url":"https://security.archlinux.org/AVG-2041","reference_id":"AVG-2041","reference_type":"","scores":[{"value":"High","scoring_system":"archlinux","scoring_elements":""}],"url":"https://security.archlinux.org/AVG-2041"},{"reference_url":"https://httpd.apache.org/security/json/CVE-2021-31618.json","reference_id":"CVE-2021-31618","reference_type":"","scores":[{"value":"important","scoring_system":"apache_httpd","scoring_elements":""}],"url":"https://httpd.apache.org/security/json/CVE-2021-31618.json"},{"reference_url":"https://www.debian.org/security/2021/dsa-4937","reference_id":"dsa-4937","reference_type":"","scores":[{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-05-20T16:18:33Z/"}],"url":"https://www.debian.org/security/2021/dsa-4937"},{"reference_url":"https://security.gentoo.org/glsa/202107-38","reference_id":"GLSA-202107-38","reference_type":"","scores":[{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-05-20T16:18:33Z/"}],"url":"https://security.gentoo.org/glsa/202107-38"},{"reference_url":"https://security.netapp.com/advisory/ntap-20210727-0008/","reference_id":"ntap-20210727-0008","reference_type":"","scores":[{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-05-20T16:18:33Z/"}],"url":"https://security.netapp.com/advisory/ntap-20210727-0008/"},{"reference_url":"https://lists.apache.org/thread.html/r14b66ef0f4f569fd515a3f96cd4eb58bd9a8ff525cc326bb0359664f%40%3Ccvs.httpd.apache.org%3E","reference_id":"r14b66ef0f4f569fd515a3f96cd4eb58bd9a8ff525cc326bb0359664f%40%3Ccvs.httpd.apache.org%3E","reference_type":"","scores":[{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-05-20T16:18:33Z/"}],"url":"https://lists.apache.org/thread.html/r14b66ef0f4f569fd515a3f96cd4eb58bd9a8ff525cc326bb0359664f%40%3Ccvs.httpd.apache.org%3E"},{"reference_url":"https://lists.apache.org/thread.html/r783b6558abf3305b17ea462bed4bd66d82866438999bf38cef6d11d1%40%3Ccvs.httpd.apache.org%3E","reference_id":"r783b6558abf3305b17ea462bed4bd66d82866438999bf38cef6d11d1%40%3Ccvs.httpd.apache.org%3E","reference_type":"","scores":[{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-05-20T16:18:33Z/"}],"url":"https://lists.apache.org/thread.html/r783b6558abf3305b17ea462bed4bd66d82866438999bf38cef6d11d1%40%3Ccvs.httpd.apache.org%3E"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/560?format=json","purl":"pkg:apache/httpd@2.4.48","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-9u53-b79b-cfgd"},{"vulnerability":"VCID-db6k-j9mj-e7hy"},{"vulnerability":"VCID-mtg7-8556-kbgd"},{"vulnerability":"VCID-rdtq-8ng5-53fn"},{"vulnerability":"VCID-wrw6-uzz4-rkfb"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apache/httpd@2.4.48"}],"aliases":["CVE-2021-31618"],"risk_score":4.0,"exploitability":"0.5","weighted_severity":"8.0","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-6b7y-562y-suce"}],"fixing_vulnerabilities":[],"risk_score":"4.0","resource_url":"http://public2.vulnerablecode.io/packages/pkg:apache/httpd@2.4.47"}