Secunia Security Advisory – Some vulnerabilities have been reported in Zaptel, which can be exploited by malicious, local users to cause a DoS (Denial of Service) and potentially gain escalated privileges.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/72545/sa32947.txt
Source: https://packetstormsecurity.com/files/72545/Secunia-Security-Advisory-32947.html