CVE-2026-78008

published 2026-08-28

CVE-2026-78008: A buffer overflow vulnerability in the WatchGuard Fireware OS Management Web UI allows an authenticated administrator with network access to cause a denial of…

Priority P3 52 high 8.6 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 E X CR X IR X AR X MAV X MAC X MAT X MPR X MUI X MVC X MVI X MVA X MSC X MSI X MSA X S X AU X R X V X RE X U X

A buffer overflow vulnerability in the WatchGuard Fireware OS Management Web UI allows an authenticated administrator with network access to cause a denial of service (DoS) condition or potentially execute arbitrary code by sending specially crafted network traffic.

Affected

4 ranges

Vendor	Product	Version range	Fixed in
watchguard	fireware_os	>= 12.0 < 12.12.2	12.12.2
watchguard	fireware_os	>= 12.0 < 12.5.20	12.5.20
watchguard	fireware_os	>= 2025.0 < 2026.2.2	2026.2.2
watchguard	fireware_os	>= 2026.3 < 2026.3.1	2026.3.1

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.

CWE-787