Symantec Brightmail AntiSpam (SBAS) before 6.0.4, when the Control Center is allowed to connect from any computer, allows remote attackers to cause a denial of service (application freeze) "by sending invalid posts".
http://www.vupen.com/english/advisories/2006/3018
http://www.securityfocus.com/bid/19182
http://securitytracker.com/id?1016600
http://securityresponse.symantec.com/avcenter/security/Content/2006.07.27.html