Secunia Security Advisory – A vulnerability has been reported in Nortel IP Softphone 2050, which can be exploited by malicious people to cause a DoS (Denial of Service) and potentially to compromise a vulnerable system.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/60178/sa27252.txt
Source: https://packetstormsecurity.com/files/60178/Secunia-Security-Advisory-27252.html