CVE-2011-4317: The mod_proxy module in the Apache HTTP Server 1.3.x through 1.3.42, 2.0.x through 2.0.64, and 2.2.x throug...

Security readout for executives and security teams

This flaw can let an attacker abuse certain Apache reverse proxy configurations to reach internal servers through the public web server. The issue affects older Apache HTTP Server 1.3, 2.0, and 2.2 releases when a prior patch for CVE-2011-3368 is present but incomplete. Exposure is most likely on legacy Apache HTTP Server reverse proxies using RewriteRule or ProxyPassMatch and running affected 1.3.x, 2.0.x, or 2.2.x versions. Modern deployments are less likely affected, but inherited appliances or vendor-bundled httpd packages need review. Prioritize legacy internet-facing reverse proxies because the business impact is internal network exposure through a public service. If affected systems remain in production, treat remediation as urgent hygiene even without confirmed active exploitation. Mitigation focus: Inventory Apache reverse proxies and confirm httpd version, module use, and proxy rewrite rules.; Apply applicable vendor httpd security updates or follow current vendor guidance.; Review RewriteRule and ProxyPassMatch reverse proxy patterns for unintended internal routing..

Prepared

Jun 27, 2026, 17:48 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.