Fortinet FortiOS is a security operating system dedicated to the FortiGate network security platform from Fortinet, a US-based company. The system provides users with a variety of security features such as firewall, anti-virus, IPSec/SSLVPN, Web content filtering and anti-spam.Fortinet FortiOS has a security vulnerability that can be exploited by an attacker to bypass FortiOS restrictions by Execute Restore Src-vis to escalate his privileges.