Fortinet FortiOS is a security operating system from Fortinet, a US-based company dedicated to the FortiGate network security platform. The system provides users with a variety of security features such as firewall, anti-virus, VPN, Web content filtering and anti-spam.Fortinet FortiOS SSLVPN remote code execution vulnerability can be exploited by attackers to execute arbitrary malicious code on the server side and gain system privileges.