FreeProxy before 3.92 Build 1626 allows malicious users to cause a denial of service (infinite loop) via a HOST: header with a hostname and port number that refers to the server itself.
marc.info/?l=bugtraq&m=117086856902907&w=2
marc.info/?l=full-disclosure&m=117085666921871&w=2
osvdb.org/33116
secunia.com/advisories/24064
www.handcraftedsoftware.org/index.php?page=3&mode=article&k=60
www.securityfocus.com/bid/22445
www.vupen.com/english/advisories/2007/0514
exchange.xforce.ibmcloud.com/vulnerabilities/32303