KsIRC 1.3.12 allows remote attackers to cause a denial of service (crash) via a long PRIVMSG string when connecting to an Internet Relay Chat (IRC) server, which causes an assertion failure and results in a NULL pointer dereference. NOTE: this issue was originally reported as a buffer overflow.
https://exchange.xforce.ibmcloud.com/vulnerabilities/31134
http://www.ubuntu.com/usn/usn-409-1