Improper verification of source of a communication channel in FortiOS - CVE-2025-62439

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Main Vulnerability Database Vulnerabilities #VU122535

Improper verification of source of a communication channel in FortiOS - CVE-2025-62439

Published: February 10, 2026


Vulnerability identifier: #VU122535
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-62439
CWE-ID: CWE-940
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Fortinet, Inc
Affected software:
FortiOS

Detailed vulnerability description

The vulnerability allows a remote user to gain unauthorized access to protected network.

The vulnerability exists due to firewall policy bypass in FSSO Terminal Services Agent. A remote authenticated user with knowledge of FSSO policy configurations can gain unauthorized access to protected network resources via crafted requests.


How to mitigate CVE-2025-62439

The vulnerability is resolved with the latest version of ForiOS with FSSO TS Agent version 5.0 build 0324 and later.

Sources