High 8.6Published Mar 3, 2026

CVE-2026-3342WatchGuard Firebox Out of Bounds Write Vulnerability

Updated under an hour ago (Oct 26, 2026, 10:30 PM ET)

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It affects WatchGuard Fireware OS and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for WatchGuard Fireware OS

Exploited in the last 30 days

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: 8.6 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-787
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: WatchGuard
NVD analysis: Analyzed
Record last updated: Mar 4, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

WatchGuard Fireware OS watchguard:fireware_os (from the name)	from 11.9 through 11.12.4+541730; from 12.0 through 12.11.7; from 12.5 through 12.5.16; from 2025.1 through 2026.1.1	CNA record
watchguard fireware watchguard:fireware	from 12.5 before 12.5.17; from 2025.1 before 2026.1.2; from 11.9 before 12.11.8	NVD

References

References

https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00003	vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.