The default configuration of Cisco Tandberg C Series Endpoints, and Tandberg E and EX Personal Video units, with software before TC4.0.0 has a blank password for the root account, which makes it easier for remote attackers to obtain access via an unspecified login method.
http://www.securityfocus.com/bid/46107
http://www.kb.cert.org/vuls/id/436854
http://www.exploit-db.com/exploits/16100
http://www.cisco.com/en/US/products/ps11422/products_security_advisory09186a0080b69541.shtml
http://tools.cisco.com/security/center/viewAlert.x?alertId=22314
http://securitytracker.com/id?1025017