Mandriva Linux Security Advisory 2009-133 – Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one-byte buffer under-read and a one-byte buffer underflow. This update provides fixes for this vulnerability.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/78432/MDVSA-2009-133.txt
Source: https://packetstormsecurity.com/files/78432/Mandriva-Linux-Security-Advisory-2009-133.html