CVE-2026-3342

WatchGuard Firebox Out of Bounds Write Vulnerability

At a glance

Severity: HIGH 8.6
EPSS: EPSS 6.65 % · percentile 94 (2026-10-27)
State: PUBLISHED
Published: 2026-03-03
Updated: 2026-03-04
Assigner: WatchGuard
NVD status: Analyzed

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.

Scores

Version	Score	Vector	Scored by
CVSS 4.0	HIGH 8.6	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	WatchGuard
CVSS 4.0	HIGH 8.6	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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X	NVD · 5d1c2695-1a31-4499-88ae-e847036fd7e3 (Secondary)
CVSS 3.1	HIGH 7.2	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H	NVD · nvd@nist.gov (Primary)

Weaknesses (CWE)

CWE-787

European references

ENISA EUVD · EUVD-2026-9288
GCVE · GCVE-0-2026-3342

Affected configurations (NVD CPE)

cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:* ≥ 12.5 < 12.5.17
cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:* ≥ 2025.1 < 2026.1.2
cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:* ≥ 11.9 < 12.11.8

Affected products

Product	Versions
WatchGuard · Fireware OS	affected 11.9 ≤ 11.12.4+541730 ; affected 12.0 ≤ 12.11.7 ; affected 12.5 ≤ 12.5.16 ; affected 2025.1 ≤ 2026.1.1

References

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

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD