Cross-site scripting vulnerability in thttpd 2.20 and earlier allows remote attackers to execute arbitrary script via a URL to a nonexistent page, which causes thttpd to insert the script into a 404 error message.
http://www.iss.net/security_center/static/9029.php
http://www.ifrance.com/kitetoua/tuto/5holes1.txt
http://www.acme.com/software/thttpd/#releasenotes
http://archives.neohapsis.com/archives/vuln-dev/2002-q2/0155.html