source: http://www.securityfocus.com/bid/9741/info

It has been reported that the GameSpy SDK is prone to a remote denial of service vulnerability. This issue is due to the software failing to handle exceptional conditions during network communication.

Exploitation of this issue may cause the affected GameSpy developed game to crash, denying service to legitimate users.

http://www.exploit-db.com/sploits/23757.zip