Debian Security Advisory 1834 – A denial of service flaw was found in the Apache mod_proxy module when it was used as a reverse proxy. A remote attacker could use this flaw to force a proxy process to consume large amounts of CPU time. This issue did not affect Debian 4.0 “etch”.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/79283/dsa-1834-1.txt
Source: https://packetstormsecurity.com/files/79283/Debian-Linux-Security-Advisory-1834-1.html