How severe is CVE-2025-13940?

CVE-2025-13940 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2025-13940 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-13940?

CVE-2025-13940 affects Watchguard Fireware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-13940?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-13940 have an EU (EUVD) identifier?

Yes. CVE-2025-13940 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201299.

When was CVE-2025-13940 published?

CVE-2025-13940 was published on 2025-12-04 and last updated on 2026-06-17.

CVE-2025-13940

CVE-2025-13940 is a medium-severity vulnerability in Watchguard Fireware with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-440.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v4: 6.7
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-201299
Weakness: CWE-440
Affected product: Watchguard Fireware
Published: 2025-12-04
Last modified: 2026-06-17

Description

An Expected Behavior Violation [CWE-440] vulnerability in WatchGuard Fireware OS may allow an attacker to bypass the Fireware OS boot time system integrity check and prevent the Firebox from shutting down in the event of a system integrity check failure. The on-demand system integrity check in the Fireware Web UI will correctly show a failed system integrity check message in the event of a failure.This issue affects Fireware OS: from 12.8.1 through 12.11.4, from 2025.1 through 2025.1.2.

Frequently asked questions

What is CVE-2025-13940?: An Expected Behavior Violation [CWE-440] vulnerability in WatchGuard Fireware OS may allow an attacker to bypass the Fireware OS boot time system integrity check and prevent the Firebox from shutting down in the event of a system integrity check failure. The on-demand system integrity check in the Fireware Web UI will correctly show a failed system integrity check message in the event of a failure.This issue affects Fireware OS: from 12.8.1 through 12.11.4, from 2025.1 through 2025.1.2.
How severe is CVE-2025-13940?: CVE-2025-13940 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2025-13940 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-13940?: CVE-2025-13940 affects Watchguard Fireware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-13940?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-13940 have an EU (EUVD) identifier?: Yes. CVE-2025-13940 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201299.
When was CVE-2025-13940 published?: CVE-2025-13940 was published on 2025-12-04 and last updated on 2026-06-17.

References

https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00026

Affected products (1)

cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*

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