Secunia Security Advisory – Joffrey Czarney has reported a weakness in Cisco Unified IP Phones, which can be exploited by malicious people to bypass certain security restrictions.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/61357/sa27829.txt
Source: https://packetstormsecurity.com/files/61357/Secunia-Security-Advisory-27829.html