source: http://www.securityfocus.com/bid/30582/info

Halo: Combat Evolved is prone to multiple remote denial-of-service vulnerabilities because the application fails to properly handle specially crafted network packets.

An attacker may exploit these issues to crash the affected application, denying service to legitimate users.

Halo: Combat Evolved 1.0.7.0615 is vulnerable; other versions may also be affected. 

https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/32192-1.zip
https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/32192-2.zip