Medium severity · published Mar 3, 2026
CVE-2026-3344
WatchGuard Firebox System Integrity Check Bypass
4.9
CVSS
0.3%
EPSS
No
On KEV
Description
A vulnerability in WatchGuard Fireware OS may allow an attacker to bypass the Fireware OS filesystem integrity check and maintain limited persistence via a maliciously-crafted firmware update package.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 21% 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 2026.1.2; 12.0 before 12.11.8; 12.0 before 12.5.17 · source: vendor
FI
Fireware · Watchguard
12.0 before 12.11.8; 12.5.9 before 12.5.17; 2025.1 before 2026.1.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-3344
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-3344
psirt.watchguard.com
https://psirt.watchguard.com/CVE-2026-3344
Vendor Advisory
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00005
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