CVE-2011-3368: Apache HTTP Server

Medium severity, CVSS 5.0. EPSS: 90.7% chance of exploitation in the next 30 days.

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 through 2.2.21 does not properly interact with use of (1) RewriteRule and (2) ProxyPassMatch pattern matches for configuration of a reverse proxy, which allows remote attackers to send requests to intranet servers via a malformed URI containing an initial @ (at sign) character.

Affected products

• Apache HTTP Server: version 1.3 only; version 1.3.0 only; version 1.3.1 only; version 1.3.1.1 only; version 1.3.2 only; version 1.3.3 only; …

Published 2011-10-05. Last modified 2026-06-16.