Fortinet FortiOS is a dedicated security operating system on the FortiGate network security platform.Fortinet FortiProxy is a secure network proxy that protects employees from cyberattacks by combining a variety of detection technologies, such as Web filtering, DNS filtering, DLP, anti-virus, intrusion prevention, and advanced threat protection. . A null pointer dereference vulnerability exists in Fortinet FortiOS and FortiProxy, which can be exploited by an attacker to cause a denial of service via a specially crafted HTTP request.