Client Software WinCom LPD Total 3.0.2.623 and earlier allows remote attackers to bypass authentication and perform administrative actions via vectors involving "simply skipping the auth stage."
http://www.vupen.com/english/advisories/2008/0410
http://www.securityfocus.com/bid/27614
http://www.securityfocus.com/archive/1/487507/100/200/threaded
http://securityreason.com/securityalert/4610
http://secunia.com/advisories/28763