source: http://www.securityfocus.com/bid/12862/info

Multiple FUN labs games are affected by remote denial of service vulnerabilities.

A remote attacker can cause a game server to stop responding by sending an empty UDP packet.

Another vulnerability can allow a remote attacker to send a malformed join packet and crash the server.

These issues can be exploited to cause a denial of service condition in the server. 

http://www.exploit-db.com/sploits/25255.zip