LiteSpeed Technologies LiteSpeed Web Server 4.0.x before 4.0.15 allows remote attackers to read the source code of scripts via an HTTP request with a null byte followed by a .txt file extension.
http://www.securityfocus.com/bid/40815
http://www.litespeedtech.com/support/forum/showthread.php?t=4078
http://www.litespeedtech.com/latest/litespeed-web-server-4.0.15-released.html