Secunia Security Advisory – Some vulnerabilities have been reported in Cisco Unified IP Phone models, which can be exploited by malicious users to compromise a vulnerable device or by malicious people to cause a DoS (Denial of Service) and compromise a vulnerable device.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/63671/sa28935.txt
Source: https://packetstormsecurity.com/files/63671/Secunia-Security-Advisory-28935.html