Cisco Unified IP Phones 7900 devices (aka TNP phones) with software before 9.2.1 allow local users to gain privileges via unspecified vectors, aka Bug ID CSCtn65815.
http://www.securitytracker.com/id?1025588
http://www.securityfocus.com/bid/48079
http://www.cisco.com/en/US/products/products_security_advisory09186a0080b80111.shtml