Sourcefire is aware of a possible Snort evasion that exists in the http_inspect preprocessor. This evasion case only applies to protected Apache web servers. Patches will be released for the 2.4 and 2.6 branches on Monday, June 5th.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/47001/sourceEvade.txt
Source: https://packetstormsecurity.com/files/47001/sourceEvade.txt.html