CVE-2026-103594

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.

Score

CVSS 4.0 9.5 Critical

Status

Awaiting Analysis - 5d1c2695-1a31-4499-88ae-e847036fd7e3

Published

2026-10-27

Last modified

2026-10-28

Weaknesses

CWE-121, CWE-1284, CWE-787

Affected products

• Fireware Os (Watchguard)

References

• https://psirt.watchguard.com/CVE-2026-103594