Aprelium Technologies Abyss Web Server 1.1.2, and possibly other versions before 1.1.4, allows remote attackers to cause a denial of service (crash) via an HTTP GET message with empty (1) Connection or (2) Range fields.
https://exchange.xforce.ibmcloud.com/vulnerabilities/11718
https://euvd.enisa.europa.eu/vulnerability/EUVD-2003-1354
http://www.securityfocus.com/bid/7287
http://archives.neohapsis.com/archives/bugtraq/2003-04/0095.html