The parsing engine in Fortinet can be bypassed by a specially crafted and formated archive file. The bug results in denying the engine the possibility to inspect code within the archive. There is no inspection of the content at all.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/76788/TZO-112009-fortinet.txt
Source: https://packetstormsecurity.com/files/76788/Fortinet-Bypass-And-Evasion.html