FortiOS
CVE-2025-25253: Improper Validation of Certificate with Host Mismatch in FortiProxy, FortiOS and others
An Improper Validation of Certificate with Host Mismatch vulnerability [CWE-297] in FortiProxy version 7.6.1 and below, version 7.4.8 and below, 7.2 all versions, 7.0 all versions and FortiOS version 7.6.2 and below, version 7.4.8 and below, 7.2 all versions, 7.0 all versions ZTNA proxy may allow an unauthenticated attacker in a man-in-the middle position to intercept and tamper with connections to the ZTNA proxy
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| FortiProxy 7.6.0 to 7.6.1 | 7.6.2 or later |
| FortiProxy 7.4.0 to 7.4.8 | 7.4.9 or later |
| FortiProxy 7.2.0 to 7.2.15 | Upgrade past 7.2.15; see the advisory |
| FortiProxy 7.0.0 to 7.0.22 | Upgrade past 7.0.22; see the advisory |
| FortiOS 7.6.0 to 7.6.2 | 7.6.3 or later |
| FortiOS 7.4.0 to 7.4.8 | 7.4.9 or later |
| FortiOS 7.2.0 to 7.2.12 | Upgrade past 7.2.12; see the advisory |
| FortiOS 7.0.0 to 7.0.18 | Upgrade past 7.0.18; see the advisory |
| FortiPAM 1.4 | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
An Improper Validation of Certificate with Host Mismatch vulnerability [CWE-297] in FortiProxy version 7.6.1 and below, version 7.4.8 and below, 7.2 all versions, 7.0 all versions and FortiOS version 7.6.2 and below, version 7.4.8 and below, 7.2 all versions, 7.0 all versions ZTNA proxy may allow an unauthenticated attacker in a man-in-the middle position to intercept and tamper with connections to the ZTNA proxy
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 10 Oct 2026.