CVE-2026-103594
Fireware OS Stack Buffer Overflow in WireGuard Configuration Allows Remote Code Execution
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.
Fixes and workarounds
Fix
Fireware OS 2026.4, Fireware OS 12.12.4
Source: CNA: WatchGuardAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| Fireware OS WatchGuard Platforms: Default |
≥ 2026.2; < 2026.4 (affected, custom) ≥ 12.12; < 12.12.4 (affected, custom) Other versions: unaffected |
CNA: WatchGuard |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 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 | CNA: WatchGuard |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://psirt.watchguard.com/CVE-2026-103594CNA: WatchGuard · vendor-advisory
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