The Web Administrator service (STEMWADM.EXE) in Websense Personal Email Manager 7.1 before Hotfix 4 and Email Security 7.1 before Hotfix 4 allows remote attackers to cause a denial of service (crash) by sending a HTTP GET request to TCP port 8181 and closing the socket before the service can send a response.
http://www.vupen.com/english/advisories/2009/2987
http://www.securityfocus.com/archive/1/507329/100/0/threaded
http://secunia.com/advisories/37091