source: http://www.securityfocus.com/bid/12423/info

Painkiller is reported prone to a remote buffer overflow vulnerability. This issue presents itself due to insufficient boundary checks performed by the application during server-side authorization of a Gamespy cd-key hash.

Painkiller versions 1.35 and prior are reported vulnerable to this issue. 

https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/25079.tar