Public Date:
871685: CVE-2012-4557 httpd: mod_proxy_ajp worker moved to error state when timeout exceeded

The MITRE CVE dictionary describes this issue as:

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.

Find out more about CVE-2012-4557 from the MITRE CVE dictionary dictionary and NIST NVD.


This issue did not affect the version of httpd as shipped with Red Hat Enterprise Linux 5.

CVSS v2 metrics

Base Score 2.6
Base Metrics AV:N/AC:H/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity High
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat JBoss Enterprise Web Server 1 for RHEL 5 Server (httpd) RHSA-2011:0897 2011-06-22
Red Hat JBoss Web Server 1.0 for RHEL 4 AS RHSA-2011:0897 2011-06-22
Red Hat JBoss Web Server 1.0 RHSA-2011:0896 2011-06-22
Red Hat Enterprise Linux 6 (httpd) RHSA-2013:0512 2013-02-20
Red Hat JBoss Enterprise Web Server 1 for RHEL 6 Server (httpd) RHSA-2011:0897 2011-06-22

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 5 httpd Not affected
Red Hat Enterprise Linux 4 httpd Not affected
Unless explicitly stated as not affected, all previous versions of packages in any minor update stream of a product listed here should be assumed vulnerable, although may not have been subject to full analysis.
Last Modified

CVE description copyright © 2017, The MITRE Corporation