Roxen web server earlier than 2.0.69 allows allows remote attackers to bypass access restrictions, list directory contents, and read source code by inserting a null character (%00) to the URL.
https://exchange.xforce.ibmcloud.com/vulnerabilities/4965
http://www.securityfocus.com/bid/1510
http://archives.neohapsis.com/archives/bugtraq/2000-07/0307.html