CVE-2026-103594 Fireware OS Stack Buffer Overflow in WireGuard Configuration Allows Remote Code Execution

CriticalCVSS 9.5 EPSS 0.43%

Published: 2026-10-27 17:52
Updated: 2026-11-04 23:17
Exploit status: No public exploit known

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.

Affected products

Product	Affected versions	Fixed in
WatchGuard Fireware OS	>= 2026.2, < 2026.4	2026.4
WatchGuard Fireware OS	>= 12.12, < 12.12.4	12.12.4

References

psirt.watchguard.com vendor-advisory

CVSS v4.0

9.5 Critical

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

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: Present
Privileges Required: None
User Interaction: None
Vulnerable System Confidentiality: High
Vulnerable System Integrity: High
Vulnerable System Availability: High
Subsequent System Confidentiality: High
Subsequent System Integrity: High
Subsequent System Availability: High

All scores (2)

v4.0 9.5 · watchguard
v4.0 9.5 · 5d1c2695-1a31-4499-88ae-e847036fd7e3

Weakness & likelihood

EPSS (exploitation probability, 30 days): 0.43% (percentile 38.0)
CWE: CWE-121 CWE-1284 CWE-787

Public exploit references

Metadata only. CVERadar never hosts or runs exploit code.

No public exploit references known.