Imatix Xitami 2.5 b5 does not properly terminate certain Keep-Alive connections that have been broken or closed early, which allows remote attackers to cause a denial of service (crash) via a large number of concurrent sessions.
http://www.securityfocus.com/bid/5394
http://www.iss.net/security_center/static/9751.php
http://archives.neohapsis.com/archives/bugtraq/2002-07/0516.html