LiteSpeed Web Server before 3.2.4 allows remote attackers to trigger use of an arbitrary MIME type for a file via a "%00." sequence followed by a new extension, as demonstrated by reading PHP source code via requests for .php%00.txt files, aka "Mime Type Injection."
https://www.exploit-db.com/exploits/4556
https://exchange.xforce.ibmcloud.com/vulnerabilities/37380
http://www.securityfocus.com/bid/26163
http://www.litespeedtech.com/latest/litespeed-web-server-3.2.4-released.html