Stack-based buffer overflow in the CL_ParseDownload function of Quake 3 Engine 1.32c and earlier, as used in multiple products, allows remote attackers to execute arbitrary code via a svc_download command with compressed data that triggers the overflow during expansion.
http://www.vupen.com/english/advisories/2006/2129
http://www.securityfocus.com/bid/18271
http://www.securityfocus.com/archive/1/435963/100/0/threaded
http://securitytracker.com/id?1016219