Medium severity · published Dec 4, 2025
CVE-2025-13940
WatchGuard Firebox Boot Time System Integrity Check Bypass
5.5
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 2% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FO
Fireware OS · WatchGuard
2025.1 before 2025.1.3; 12.8.1 before 12.11.5 · source: vendor
FI
Fireware · Watchguard
2025.1 before 2025.1.3; 12.8.1 before 12.11.5 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-13940
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-13940
psirt.watchguard.com
https://psirt.watchguard.com/CVE-2025-13940
Vendor Advisory
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00026
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