Multiple directory traversal vulnerabilities in thttpd 2.07 beta 0.4, when running on Windows, allow remote attackers to read arbitrary files via a URL that contains (1) a hex-encoded backslash dot-dot sequence ("%5C..") or (2) a drive letter (such as "C:").
https://exchange.xforce.ibmcloud.com/vulnerabilities/16882
http://www.acme.com/software/thttpd/#releasenotes
http://marc.info/?l=bugtraq&m=109164010629836&w=2
http://archives.neohapsis.com/archives/fulldisclosure/2004-08/0097.html