CVE-2026-103594

Fireware OS Stack Buffer Overflow in WireGuard Configuration Allows Remote Code Execution

Published Oct 27, 2026 CVSS 4.0 · 9.5 Critical EPSS < 1% KEV · Not listed
Description
A stack-based buffer overflow vulnerability in Fireware OS's WireGuard configuration processing allows a remote attacker that has man-in-the-middle TLS-decrypted access between the Firebox and WatchGuard Cloud to create a Denial of Service condition and potentially execute arbitrary code by tampering with a FireCloud Gateway configuration payload.

Remediation

Vendor Solution

Fireware OS 2026.4, Fireware OS 12.12.4

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description A stack-based buffer overflow vulnerability in Fireware OS's WireGuard configuration processing allows a remote attacker that has man-in-the-middle TLS-decrypted access between the Firebox and WatchGuard Cloud to create a Denial of Service condition and potentially execute arbitrary code by tampering with a FireCloud Gateway configuration payload.
Title Fireware OS Stack Buffer Overflow in WireGuard Configuration Allows Remote Code Execution
First Time appeared Watchguard
Watchguard fireware Os
Weaknesses CWE-121
CWE-1284
CWE-787
CPEs cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*
Vendors & Products Watchguard
Watchguard fireware Os
References
Metrics cvssV4_0

{'score': 9.5, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
WatchGuard
Published
Updated
Nov 4, 2026, 8:26 PM
Reserved
Sep 30, 2026, 10:34 PM
Status
Awaiting Analysis
Published
Oct 27, 2026, 4:17 PM
Modified
Nov 4, 2026, 9:17 PM