Secunia Security Advisory – Ubuntu has issued an update for apache2. This fixes a vulnerability, which potentially can be exploited by malicious people to cause a DoS (Denial of Service).
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/42136/sa17923.txt
Source: https://packetstormsecurity.com/files/42136/Secunia-Security-Advisory-17923.html