Buffer overflow in Watchfire AppScan QA 5.0.609 and 5.0.134 allows remote web servers to execute arbitrary code via an HTTP 401 response with a WWW-Authenticate header containing a long Realm field.
http://www.vupen.com/english/advisories/2005/2933
http://www.securityfocus.com/archive/1/419586/100/0/threaded
http://securitytracker.com/id?1015362