Buffer overflow in the telnet server in Cisco Unified IP Phone 7906G, 7911G, 7941G, 7961G, 7970G, and 7971G running SCCP firmware might allow remote authenticated users to execute arbitrary code via a crafted command.
https://exchange.xforce.ibmcloud.com/vulnerabilities/40493
http://www.vupen.com/english/advisories/2008/0543
http://www.securitytracker.com/id?1019410
http://www.securityfocus.com/bid/27774
http://www.cisco.com/en/US/products/products_security_advisory09186a0080949c7a.shtml