High severity · published Mar 3, 2026
CVE-2026-3342
WatchGuard Firebox Out of Bounds Write Vulnerability
7.2
CVSS
6.7%
EPSS
No
On KEV
Description
An Out-of-bounds Write vulnerability in WatchGuard Fireware OS may allow an authenticated privileged administrator to execute arbitrary code with root permissions via an exposed management interface.
This vulnerability affects Fireware OS 11.9 up to and including 11.12.4_Update1, 12.0 up to and including 12.11.7 and 2025.1 up to and including 2026.1.1.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)6.7% · higher than 94% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FO
Fireware OS · WatchGuard
11.9 through 11.12.4+541730; 12.0 through 12.11.7; 12.5 through 12.5.16; 2025.1 through 2026.1.1 · source: vendor
FI
Fireware · Watchguard
12.5 before 12.5.17; 2025.1 before 2026.1.2; 11.9 before 12.11.8 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-3342
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-3342
Vendor Advisory
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00003
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