Secunia Security Advisory – Ubuntu has issued an update for quassel. This fixes a vulnerability, which can be exploited by malicious users to cause a DoS (Denial of Service).
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/94209/sa41567.txt
Source: https://packetstormsecurity.com/files/94209/Secunia-Security-Advisory-41567.html