SimBin GTR - FIA GT Racing Game 1.5.0.0 and earlier, GT Legends 1.1.0.0 and earlier, GTR 2 1.1 and earlier, and RACE - The WTCC Game 1.0 and earlier allow remote attackers to cause a denial of service (client disconnection) via an empty UDP packet to the server port.
http://www.vupen.com/english/advisories/2007/0696
http://www.securityfocus.com/bid/22651
http://www.securityfocus.com/archive/1/460762/100/0/threaded