Debian Linux Security Advisory 1980-1 – David Leadbeater discovered an integer underflow that could be triggered via the LINKS command and can lead to a denial of service or the execution of arbitrary code (CVE-2009-4016). This issue affects both, ircd-hybrid and ircd-ratbox.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/85724/dsa-1980-1.txt
Source: https://packetstormsecurity.com/files/85724/Debian-Linux-Security-Advisory-1980-1.html