Quake 3 arena 1.29f and 1.29g allows remote attackers to cause a denial of service (crash) via a malformed connection packet that begins with several char-255 characters.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2001-1270
http://www.securityfocus.com/bid/3123
http://archives.neohapsis.com/archives/bugtraq/2001-07/0748.html