source: http://www.securityfocus.com/bid/30427/info

Unreal Tournament 2004 is prone to a remote denial-of-service vulnerability because the application fails to handle NULL-pointer exceptions.

An attacker could exploit this issue to crash the affected application, denying service to legitimate users.

This issue affects Unreal Tournament 2004 v3369 and prior versions. 

http://www.exploit-db.com/sploits/32125.zip