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9.5
CVE-2026-103594: Fireware OS WireGuard config can be tampered to run code
CVE-2026-103594 · published today
Summary
WatchGuard's Fireware OS may mishandle WireGuard configuration data. If an attacker can intercept and modify the cloud‑gateway messages, they could cause the device to crash or execute their own code. Apply the latest software update from WatchGuard to fix the issue.
What to do
- Update watchguard fireware os to version 2026.4 or later.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| watchguard | fireware os | < 2026.4 |
Original advisory text
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.
References
- https://psirt.watchguard.com/CVE-2026-103594 vendor-advisory
Internet-facing
14 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit (estimated)
- Gives an attacker full control (estimated)
Type
CWE-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
CWE-1284Improper Validation of Specified Quantity in Input
Timeline
Published27 Oct 2026
Updated27 Oct 2026
First seen27 Oct 2026
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