CVE-2022-39948: Fortinet FortiOS

High severity, CVSS 7.4. EPSS: 0.3% chance of exploitation in the next 30 days.

An improper certificate validation vulnerability [CWE-295] in FortiOS 7.2.0 through 7.2.3, 7.0.0 through 7.0.7, 6.4 all versions, 6.2 all versions, 6.0 all versions and FortiProxy 7.0.0 through 7.0.6, 2.0 all versions, 1.2 all versions may allow a remote and unauthenticated attacker to perform a Man-in-the-Middle attack on the communication channel between the FortiOS/FortiProxy device and remote servers hosting threat feeds (when the latter are configured as Fabric connectors in FortiOS/FortiProxy)

Affected products

• Fortinet FortiOS: from 6.0.0, before 7.0.8 (fixed in 7.0.8); from 7.2.0, before 7.2.4 (fixed in 7.2.4)
• Fortinet FortiProxy: from 1.2.0, up to and including 2.0.9; from 7.0.0, before 7.0.7 (fixed in 7.0.7)

Published 2023-02-16. Last modified 2026-06-17.