# CVE-2026-81851

## Summary

- **CVE ID:** CVE-2026-81851
- **Severity:** MEDIUM
- **CVSS Score:** 6.9 (CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-122, CWE-1284
- **Published:** Aug 27, 2026
- **Last Modified:** Aug 28, 2026

## Description

A heap-based buffer overflow vulnerability in Fireware OS's iked process allows an authenticated administrator to crash the IKE daemon (iked), resulting in a denial of service, by saving a specially crafted configuration.

## Affected Products

- WatchGuard — Fireware OS (2025.0)
- WatchGuard — Fireware OS (12.0)

## References

- [CNA](https://psirt.watchguard.com/CVE-2026-81851)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.25%
- **EPSS Percentile:** 15.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._