The default installation of Apache before 1.3.19 allows remote attackers to list directories instead of the multiview index.html file via an HTTP request for a path that contains many / (slash) characters, which causes the path to be mishandled by (1) mod_negotiation, (2) mod_dir, or (3) mod_autoindex.
https://exchange.xforce.ibmcloud.com/vulnerabilities/6921
http://www.securityfocus.com/archive/1/178066
http://www.securityfocus.com/archive/1/168497
http://www.linuxsecurity.com/advisories/other_advisory-1452.html