Allegro RomPager HTTP server allows remote attackers to cause a denial of service via a malformed authentication request.
https://exchange.xforce.ibmcloud.com/vulnerabilities/4588
https://euvd.enisa.europa.eu/vulnerability/EUVD-2000-0469
http://www.securityfocus.com/bid/1290
http://archives.neohapsis.com/archives/bugtraq/2000-05/0398.html