CVE-2026-8247

UNKNOWN 0.0

WatchGuard Firebox admd Out of Bounds Write Vulnerability

CVSS Score

0.0

EPSS Score

0.2%

EPSS Percentile

10th

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS may allow an unauthenticated attacker on the same local network segment to execute arbitrary code. This vulnerability affects Fireware OS 11.0 up to and including 11.12.4_Update1, 12.0 up to and including 12.12 and 2025.1 up to and including 2026.2.

CWE	CWE-120
Vendor	watchguard
Product	fireware os
Published	Jul 2, 2026
Last Updated	Aug 10, 2026

Stay Ahead of the Next One

Get instant alerts for watchguard fireware os

Be the first to know when new unknown vulnerabilities affecting watchguard fireware os are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

Affected Versions

WatchGuard / Fireware OS

2025.1 < 2026.2.1 12.0 < 12.12.1 11.0 < *

WatchGuard / Fireware OS

12.0 < 12.5.19

References

NVD ↗ CVE.org ↗ EPSS Data ↗

psirt.watchguard.com: https://psirt.watchguard.com/CVE-2026-8247 watchguard.com: https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00026

Credits

Xander Mackenzie | @thetrueartist working with TrendAI Zero Day Initiative