Unreal Tournament 2004 versions 3369 and below suffer from a NULL pointer vulnerability that allows for a denial of service of the UT2004 server.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/68626/ut2004null.txt
Source: https://packetstormsecurity.com/files/68626/ut2004null.txt.html