The Call Policy Configuration page in Cisco TelePresence Video Communication Server (VCS) Expressway X8.5.3 improperly validates external DTDs, which allows remote authenticated users to read arbitrary files or cause a denial of service via a crafted XML document, aka Bug ID CSCuv31853.
http://www.securitytracker.com/id/1033283
http://www.securityfocus.com/bid/76352
http://tools.cisco.com/security/center/viewAlert.x?alertId=40446