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Vulnerability · Published Mar 3, 2026 · Assigned by WatchGuard

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

High 8.6

In plain English

A high-severity out-of-bounds write in Fireware OS from WatchGuard. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 6.4% (higher than 94% of all known vulnerabilities).

Severity (CVSS 4.0)8.6High
Exploit odds (30 days)6.4%top 6.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

VendorProductVersions
WatchGuard Fireware OS 11.9 – through 11.12.4+54173012.0 – through 12.11.712.5 – through 12.5.162025.1 – through 2026.1.1

Weakness: CWE-787 · Vector: 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

References