Quake II server before R1Q2, as used in multiple products, allows remote attackers to cause a denial of service (application crash) via a modified client that asks the server to send data stored at a negative array offset, which is not handled when processing Configstrings and Baselines.
https://exchange.xforce.ibmcloud.com/vulnerabilities/17890
http://www.securityfocus.com/bid/11551
http://web.archive.org/web/20041130092749/www.r1ch.net/stuff/r1q2/
http://secur1ty.net/advisories/001
http://archives.neohapsis.com/archives/bugtraq/2004-10/0299.html