CVE-2012-4557

CVE-2012-4557 describes a denial-of-service vulnerability in Apache HTTP Server versions 2.2.12 through 2.2.21, specifically within the mod_proxy_ajp module. An attacker can exploit this by sending a long-processing request, causing the worker node to enter an error state and consume resources. Rated with a CVSS score of 5.0, this vulnerability is easily exploitable over the network with no authentication required, leading to a partial denial of service. There is no known exploit code available, nor is there evidence of active exploitation, and it has received minimal community or media attention.