Is CVE-2025-25253 in the CISA KEV catalog?

No. CVE-2025-25253 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-25253?

CVE-2025-25253 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2025-25253?

CVE-2025-25253 has an EPSS score of 0.10% (1th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-25253?

Upgrade fortios to 7.6.3 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2025-25253

HIGH

7.5

CVSS v3

NVD

Description

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

CWE-297

How to fix

Remediation Available

fortiosNVD

Affected:>= 7.6.0, < 7.6.3Fixed in:7.6.3CVE-2025-25253derived from NVD

fortiproxyNVD

Affected:>= 7.6.0, < 7.6.2Fixed in:7.6.2CVE-2025-25253derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorAdjacent

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.10%probability of exploitation in 30 days

1stpercentile

Low risk: more likely to be exploited than 1% of all known CVEs.

References

Vendor Advisory1

fortiguard.fortinet.com

Other references1

cert-portal.siemens.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-09.