Corsaire Security Advisory – The Symantec Enterprise Firewall (SEF) 7.0 allows URLs to be blocked based on predefined regular expression patterns. Utilizing URL encoding techniques this functionality can be evaded.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/30932/SymantecFW.txt
Source: https://packetstormsecurity.com/files/30932/SymantecFW.txt.html