VulnerabilityAnalyzed

CVE-2026-3342

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.

HIGH 8.6EPSS 6.40%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (6.40%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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 4.0: 8.6 HIGHCVSS: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/M
EPSS: 6.40% probability · 93th percentile
CISA KEV: Not listed
Weakness: CWE-787
Affected: watchguard/fireware
Source: 5d1c2695-1a31-4499-88ae-e847036fd7e3

References

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.