BarracudaDrive Web Server before 3.8 allows remote attackers to read the source code for web scripts by appending a (1) + (plus), (2) . (dot), or (3) %80 and similar characters to the file name in the URL.
https://exchange.xforce.ibmcloud.com/vulnerabilities/38972
http://www.securityfocus.com/archive/1/484833/100/0/threaded