The SSH server in Cisco Unified IP Phone 7906G, 7911G, 7941G, 7961G, 7970G, and 7971G, with firmware 8.0(4)SR1 and earlier, uses a hard-coded username and password, which allows remote attackers to access the device.
https://exchange.xforce.ibmcloud.com/vulnerabilities/32627
http://www.vupen.com/english/advisories/2007/0689
http://www.securitytracker.com/id?1017681
http://www.securityfocus.com/bid/22647
http://www.cisco.com/warp/public/707/cisco-sa-20070221-phone.shtml
http://www.cisco.com/warp/public/707/cisco-air-20070221-phone.shtml