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CVE-2025-24472: Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2025-03-18
• EPSS: 7.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-11 · updated 2026-08-05
• Weakness: CWE-288

Description

An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] affecting FortiOS 7.0.0 through 7.0.16 and FortiProxy 7.2.0 through 7.2.12, 7.0.0 through 7.0.19 may allow a remote unauthenticated attacker with prior knowledge of upstream and downstream devices serial numbers to gain super-admin privileges on the downstream device, if the Security Fabric is enabled, via crafted CSF proxy requests.

Affected products

• Fortinet FortiOS (FortiGate): from 7.0.0 before 7.0.17 — fixed in 7.0.17
• Fortinet FortiProxy: from 7.0.0 before 7.0.20; from 7.2.0 before 7.2.13 — fixed in 7.0.20, 7.2.13

How to fix

Upgrade to a fixed version: Fortinet FortiOS (FortiGate) 7.0.17; Fortinet FortiProxy 7.0.20, 7.2.13. Check the vendor advisory for mitigations.

References

• https://fortiguard.fortinet.com/psirt/FG-IR-24-535
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-24472

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