Xerver Free Web Server 2.10 and earlier allows remote attackers to cause a denial of service (crash) via an HTTP request that contains many "C:/" sequences.
http://www.iss.net/security_center/static/8419.php
http://archives.neohapsis.com/archives/bugtraq/2002-03/0155.html
http://archives.neohapsis.com/archives/bugtraq/2002-03/0091.html