Unspecified vulnerability in Arkoon FAST360 UTM appliances 3.0 through 3.0/29, 3.1, 3.2, and 3.3 allows remote attackers to bypass keyword filtering in the FAST HTTP module, and signatures in the IDPS HTTP module, via crafted URLs that are "misinterpreted."
https://exchange.xforce.ibmcloud.com/vulnerabilities/27003
http://www.vupen.com/english/advisories/2006/2216
http://www.arkoon.fr/upload/alertes/32AK-2006-01-EN-1.0_EVASION_HTTP.pdf