CVE-2022-39948

Severity: high (CVSS 7.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-02-16 · updated 2026-06-17
Weakness: CWE-295

Description

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 (FortiGate): from 6.0.0 before 7.0.8; from 7.2.0 before 7.2.4 — fixed in 7.0.8, 7.2.4
Fortinet FortiProxy: from 1.2.0 through 2.0.9; from 7.0.0 before 7.0.7 — fixed in 7.0.7

How to fix

Upgrade to a fixed version: Fortinet FortiOS (FortiGate) 7.0.8, 7.2.4; Fortinet FortiProxy 7.0.7. Check the vendor advisory for mitigations.

References

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