The FTP proxy module in Fortinet FortiOS (FortiGate) before 2.80 MR12 and 3.0 MR2 allows remote attackers to bypass anti-virus scanning via the Enhanced Passive (EPSV) FTP mode.
https://exchange.xforce.ibmcloud.com/vulnerabilities/27532
http://www.vupen.com/english/advisories/2006/2467
http://www.securityfocus.com/bid/18570
http://www.fortinet.com/FortiGuardCenter/advisory/FG-2006-15.html