CVE-2012-4557
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.
Date published : 2012-11-30
http://httpd.apache.org/security/vulnerabilities_22.html#2.2.22