Webconfig, IMAP, and other services in MDaemon 3.5.0 and earlier allows remote attackers to cause a denial of service via a long URL terminated by a "\r\n" string.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2001-0064
http://www.securityfocus.com/bid/2134
http://archives.neohapsis.com/archives/bugtraq/2000-12/0315.html