#VU117216 Improper validation of certificate with host mismatch in FortiOS and FortiProxy - CVE-2025-25253

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Main Vulnerability Database Vulnerabilities #VU117216

#VU117216 Improper validation of certificate with host mismatch in FortiOS and FortiProxy - CVE-2025-25253

Published: October 15, 2025


Vulnerability identifier: #VU117216
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-25253
CWE-ID: CWE-297
Exploitation vector: Adjecent network
Exploit availability: No public exploit available
Vulnerable software:
FortiOS
FortiProxy
Software vendor:
Fortinet, Inc

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

The vulnerability exists due to improper validation of certificate with host mismatch. An unauthenticated attacker in a man-in-the middle position can intercept and tamper with connections to the ZTNA proxy.


Remediation

Install update from vendor's website.

External links