Improper Certificate Validation in FortiProxy by Fortinet
CVE-2025-25253

6.8MEDIUM

Key Information:

Vendor

Fortinet
Status
Fortipam
FortiOS
Fortiproxy
Vendor
CVE Published:
14 October 2025

What is CVE-2025-25253?

An improper validation of certificate with host mismatch vulnerability in FortiProxy and FortiOS could enable an unauthenticated attacker in a man-in-the-middle position to intercept and potentially alter connections to the Zero Trust Network Access (ZTNA) proxy. This flaw affects multiple versions of the FortiProxy and FortiOS products, leading to significant security risks that demand prompt attention to ensure secure network communications.

Affected Version(s)

FortiOS 7.6.0 <= 7.6.2

FortiOS 7.4.0 <= 7.4.8

FortiOS 7.2.0 <= 7.2.12

References

https://fortiguard.fortinet.com/psirt/FG-IR-24-457

CVSS V3.1

Score:
6.8
Severity:
MEDIUM
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Adjacent Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2025-25253 : Improper Certificate Validation in FortiProxy by Fortinet