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Fencer Intel
medium 5.0

CVE-2012-4557 json

The mod_proxy_ajp module in the Apache HTTP Server 2.2.12 through 2.2.21 places a worker node into an error state upon detection of a long…

published 2012-11-30 13 y ago modified 2026-06-16 4 mo ago also EUVD-2012-4485

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
17.5%
EPSS 17.5% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

The mod_proxy_ajp module in the Apache HTTP Server 2.2.12 through 2.2.21 places a worker node into an error state upon detection of a long request-processing time, which allows remote attackers to cause a denial of service (worker consumption) via an expensive request.

Patch / fix

  • apache2 Debian 14, Debian 13, Debian 12 2.2.22-1

debian advisories DEBIAN-CVE-2012-4557

  • httpd RHEL 6 2.2.15-26.el6
  • mod_ssl RHEL 6 1:2.2.15-26.el6
  • httpd-tools RHEL 6 2.2.15-26.el6
  • httpd-manual RHEL 6 2.2.15-26.el6
  • ant jboss enterprise web server 1 1.7.1-13.jdk6.ep5.el4
  • ant jboss enterprise web server 1 1.7.1-13.jdk6.ep5.el5
  • ant jboss enterprise web server 1 1.7.1-14.ep5.el6
  • ecj jboss enterprise web server 1 1:3.3.1.1-3.2.2.jdk6.ep5.el4

red hat advisories RHSA-2013:0512RHSA-2011:0897

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2012-4557 updated cvss 2.6

httpd: mod_proxy_ajp worker moved to error state when timeout exceeded

  • Red Hat Enterprise Linux Desktop (v. 6) httpd 2.2.15-26.el6, httpd-tools 2.2.15-26.el6 Red Hat Enterprise Linux Desktop Optional (v. 6) httpd 2.2.15-26.el6, mod_ssl 2.2.15-26.el6, httpd-manual 2.2.15-26.el6 Red Hat Enterprise Linux HPC Node (v. 6) httpd 2.2.15-26.el6, httpd-tools 2.2.15-26.el6 Red Hat Enterprise Linux HPC Node Optional (v. 6) httpd 2.2.15-26.el6, mod_ssl 2.2.15-26.el6, httpd-manual 2.2.15-26.el6 Red Hat Enterprise Linux Server (v. 6) httpd 2.2.15-26.el6, mod_ssl 2.2.15-26.el6, httpd-tools 2.2.15-26.el6, httpd-manual 2.2.15-26.el6 Red Hat Enterprise Linux Workstation (v. 6) httpd 2.2.15-26.el6, mod_ssl 2.2.15-26.el6, httpd-tools 2.2.15-26.el6, httpd-manual 2.2.15-26.el6
    fixed: vendor fix RHSA-2013:0512
  • Red Hat JBoss Enterprise Web Server 1 for RHEL 5 Server antlr 2.7.7-7.ep5.el5, dom4j 1.6.1-11.ep5.el5, ant 1.7.1-13.jdk6.ep5.el5, httpd 2.2.17-11.1.ep5.el5, mod_jk 1.2.31-1.1.ep5.el5, struts12 1.2.9-3.1.ep5.el5, +103 more Red Hat JBoss Enterprise Web Server 1 for RHEL 6 Server ant 1.7.1-14.ep5.el6, antlr 2.7.7-7.ep5.el6, cglib 2.2-5.4.ep5.el6, ecj3 3.3.1.1-4.ep5.el6, ant-jmf 1.7.1-14.ep5.el6, dom4j 1.6.1-11.1.ep5.el6, +110 more
    fixed: vendor fix RHSA-2011:0897
  • Red Hat JBoss Web Server 1.0
    fixed: vendor fix RHSA-2011:0896
  • Red Hat JBoss Web Server 1.0 for RHEL 4 AS bcel 5.2-8.1.ep5.el4, antlr 2.7.7-7.ep5.el4, dom4j 1.6.1-11.ep5.el4, mod_jk 1.2.31-1.ep5.el4, mx4j 3.0.1-9.3.4.ep5.el4, struts12 1.2.9-3.ep5.el4, +97 more Red Hat JBoss Web Server 1.0 for RHEL 4 ES bcel 5.2-8.1.ep5.el4, antlr 2.7.7-7.ep5.el4, dom4j 1.6.1-11.ep5.el4, mod_jk 1.2.31-1.ep5.el4, mx4j 3.0.1-9.3.4.ep5.el4, struts12 1.2.9-3.ep5.el4, +97 more
    fixed: vendor fix RHSA-2011:0897
  • Red Hat Enterprise Linux 4 httpd Red Hat Enterprise Linux 5 httpd
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

17.47% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • svn.apache.org http://svn.apache.org/viewvc?view=revision&revision=1227298 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-399 Resource Management Errors
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.