CVE-2021-36183: Fortinet FortiClient

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

An improper authorization vulnerability [CWE-285] in FortiClient for Windows versions 7.0.1 and below and 6.4.2 and below may allow a local unprivileged attacker to escalate their privileges to SYSTEM via the named pipe responsible for Forticlient updates.

Affected products

• Fortinet FortiClient: from 6.4.0, up to and including 6.4.2; from 7.0.0, up to and including 7.0.1

Published 2021-11-02. Last modified 2026-06-17.