Vertex4 SunAge 1.08.1 and earlier allows remote attackers to cause a denial of service ("runtime error") via a crafted join packet to UDP port 27960, probably related to an invalid nickname command.
https://exchange.xforce.ibmcloud.com/vulnerabilities/43249
http://www.vupen.com/english/advisories/2008/1903/references
http://secunia.com/advisories/30823