HTTP request smuggling vulnerability in Pound before 1.9.4 allows remote attackers to poison web caches, bypass web application firewall protection, and conduct XSS attacks via an HTTP request with conflicting Content-length and Transfer-encoding headers.
http://www.novell.com/linux/security/advisories/2006_05_19.html
http://www.gentoo.org/security/en/glsa/glsa-200606-05.xml
http://www.debian.org/security/2005/dsa-934
http://secunia.com/advisories/20510
http://secunia.com/advisories/20215