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Vulnerability details: VCID-n9e1-c2zs-zkdk
Vulnerability ID VCID-n9e1-c2zs-zkdk
Aliases CVE-2012-4557
Summary A flaw was found when mod_proxy_ajp connects to a backend server that takes too long to respond. Given a specific configuration, a remote attacker could send certain requests, putting a backend server into an error state until the retry timeout expired. This could lead to a temporary denial of service.
Status Published
Exploitability 0.5
Weighted Severity 4.5
Risk 2.2
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-399 Resource Management Errors
System Score Found at
epss 0.25967 https://api.first.org/data/v1/epss?cve=CVE-2012-4557
epss 0.25967 https://api.first.org/data/v1/epss?cve=CVE-2012-4557
epss 0.25967 https://api.first.org/data/v1/epss?cve=CVE-2012-4557
epss 0.25967 https://api.first.org/data/v1/epss?cve=CVE-2012-4557
epss 0.25967 https://api.first.org/data/v1/epss?cve=CVE-2012-4557
epss 0.25967 https://api.first.org/data/v1/epss?cve=CVE-2012-4557
epss 0.25967 https://api.first.org/data/v1/epss?cve=CVE-2012-4557
epss 0.25967 https://api.first.org/data/v1/epss?cve=CVE-2012-4557
epss 0.25967 https://api.first.org/data/v1/epss?cve=CVE-2012-4557
epss 0.25967 https://api.first.org/data/v1/epss?cve=CVE-2012-4557
epss 0.25967 https://api.first.org/data/v1/epss?cve=CVE-2012-4557
epss 0.25967 https://api.first.org/data/v1/epss?cve=CVE-2012-4557
epss 0.25967 https://api.first.org/data/v1/epss?cve=CVE-2012-4557
epss 0.25967 https://api.first.org/data/v1/epss?cve=CVE-2012-4557
apache_httpd low https://httpd.apache.org/security/json/CVE-2012-4557.json
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2012-4557
Reference id Reference type URL
http://httpd.apache.org/security/vulnerabilities_22.html#2.2.22
http://lists.opensuse.org/opensuse-updates/2013-02/msg00009.html
http://lists.opensuse.org/opensuse-updates/2013-02/msg00012.html
http://marc.info/?l=bugtraq&m=136612293908376&w=2
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2012-4557.json
https://api.first.org/data/v1/epss?cve=CVE-2012-4557
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-4557
https://lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r05b5357d1f6bd106f41541ee7d87aafe3f5ea4dc3e9bde5ce09baff8%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r476d175be0aaf4a17680ef98c5153b4d336eaef76fb2224cc94c463a%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r9821b0a32a1d0a1b4947abb6f3630053fcbb2ec905d9a32c2bd4d4ee%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r9b4b963760a3cb5a4a70c902f325c6c0337fe51d5b8570416f8f8729%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rad01d817195e6cc871cb1d73b207ca326379a20a6e7f30febaf56d24%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rdca61ae990660bacb682295f2a09d34612b7bb5f457577fe17f4d064%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org%3E
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18938
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19284
http://svn.apache.org/viewvc?view=revision&revision=1227298
http://www.debian.org/security/2012/dsa-2579
871685 https://bugzilla.redhat.com/show_bug.cgi?id=871685
cpe:2.3:a:apache:http_server:2.2.12:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:apache:http_server:2.2.12:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.2.13:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:apache:http_server:2.2.13:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.2.14:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:apache:http_server:2.2.14:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.2.15:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:apache:http_server:2.2.15:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.2.16:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:apache:http_server:2.2.16:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.2.17:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:apache:http_server:2.2.17:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.2.18:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:apache:http_server:2.2.18:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.2.19:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:apache:http_server:2.2.19:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.2.20:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:apache:http_server:2.2.20:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.2.21:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:apache:http_server:2.2.21:*:*:*:*:*:*:*
CVE-2012-4557 https://httpd.apache.org/security/json/CVE-2012-4557.json
CVE-2012-4557 https://nvd.nist.gov/vuln/detail/CVE-2012-4557
RHSA-2013:0512 https://access.redhat.com/errata/RHSA-2013:0512
USN-1765-1 https://usn.ubuntu.com/1765-1/
No exploits are available.
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2012-4557
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Exploit Prediction Scoring System (EPSS)
Percentile 0.96235
EPSS Score 0.25967
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:36:18.574767+00:00 Apache HTTPD Importer Import https://httpd.apache.org/security/json/CVE-2012-4557.json 38.0.0