The license registering interface in Symantec Web Security (SWS) before 3.0.1.85 allows attackers to cause a denial of service (CPU consumption) by submitting a large file.
http://www.vupen.com/english/advisories/2007/0330
http://securitytracker.com/id?1017558
http://securityresponse.symantec.com/avcenter/security/Content/2007.01.24c.html