What’s Vulnerable › Vulnerabilities
CVE-2025-25255
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-10-14 · updated 2026-10-18
- Weakness: CWE-358
Description
An Improperly Implemented Security Check for Standard vulnerability [CWE-358] vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiProxy 7.6.0 through 7.6.3, FortiProxy 7.4.0 through 7.4.11, FortiProxy 7.2 all versions, FortiProxy 7.0.1 through 7.0.22 may allow an unauthenticated proxy user to bypass the domain fronting protection feature via crafted HTTP requests.
Affected products
- Fortinet FortiOS (FortiGate): from 7.6.0 before 7.6.4 — fixed in 7.6.4
- Fortinet FortiProxy: from 7.0.1 before 7.6.4 — fixed in 7.6.4
How to fix
Upgrade to a fixed version: Fortinet FortiOS (FortiGate) 7.6.4; Fortinet FortiProxy 7.6.4. Check the vendor advisory for mitigations.
References
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