Medium6.8Fortinet

Medium [CVE-2025-25253] FortiOS: Improper Validation of Certificate with Host Mismatch vulnerability [CWE-297] in FortiProxy version 7.6.1 and below, version…

This medium-severity Fortinet advisory covers CVE-2025-25253 affecting FortiOS, FortiProxy.

CVE-2025-25253 Published Oct 14, 2025Updated by vendor Jul 14, 2026

CVE-2025-25253

Affected products & platforms

FortinetFortiGateFirewallFortiOSFortiProxy

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Summary

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

Affected versions

FortiOS 7.6: 7.6.0 through 7.6.2
FortiOS 7.4: 7.4.0 through 7.4.8
FortiOS 7.2: 7.2 all versions
FortiOS 7.0: 7.0 all versions
FortiProxy 7.6: 7.6.0 through 7.6.1
FortiProxy 7.4: 7.4.0 through 7.4.8
FortiProxy 7.2: 7.2 all versions
FortiProxy 7.0: 7.0 all versions

Official advisory · high-confidence parse· fetched 9 days ago·verify at source

Fixed versions

FortiOS 7.6: 7.6.3
FortiOS 7.4: 7.4.9
FortiOS 7.2: migrate to a fixed release
FortiOS 7.0: migrate to a fixed release
FortiProxy 7.6: 7.6.2
FortiProxy 7.4: 7.4.9
FortiProxy 7.2: migrate to a fixed release
FortiProxy 7.0: migrate to a fixed release

Official advisory · high-confidence parse· fetched 9 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Upgrade per the Affected/Solution table: FortiOS 7.6: 7.6.3; FortiOS 7.4: 7.4.9; FortiOS 7.2: migrate to a fixed release; FortiOS 7.0: migrate to a fixed release; FortiProxy 7.6: 7.6.2; ….

Official advisory · high-confidence parse· fetched 9 days ago·verify at source

Sources

Official and corroborating records used to build this advisory.

FortiGuard PSIRT Advisoriesofficial
Official vendor source used to discover this advisory; it remains the authority for affected products and remediation. Discovered from the machine-readable feed https://filestore.fortinet.com/fortiguard/rss/ir.xml; this link opens the Fortinet advisory index instead of the raw feed document.
Fortinet
Official vendor advisoryofficial
Official advisory page fetched and parsed; accepted detail fields are attributed to this page.
Fortinet
CVE.org CNA affected-product recordCVE.org
Structured CNA affected[] data independently confirmed the affected product scope; native advisory content remains authoritative.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2025-25253NVD CVE.org MITRE

Official resources

FortiGate / FortiOS documentation & release notes (target: 7.6 / 7.4 / 7.2)
Release notes
This advisory names 7.6 / 7.4 / 7.2 as the first fixed releases — official upgrade documentation for FortiGate / FortiOS firewalls.
Fortinet Upgrade Path Tool
Official documentation
Official tool to plan a supported FortiOS upgrade path from your current build to the fixed release.
FortiProxy documentation & upgrade guides
Official documentation
This advisory names 7.6 / 7.4 / 7.2 as the first fixed releases — official upgrade documentation for FortiProxy.

Discussion(0)

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