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9.2
CVE-2026-112709: WatchGuard Fireware OS allows remote code execution via AD traffic
CVE-2026-112709 · published today
Summary
The Fireware OS authentication service on WatchGuard devices can be tricked by a malformed response from a compromised or intercepted Active Directory server. This could cause the device to crash or run attacker‑controlled code. Apply the vendor’s latest security update and ensure AD traffic is protected with encryption and integrity checks.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| watchguard | fireware os |
< 2026.4 < 12.5.22 |
Original advisory text
Fireware OS Heap Buffer Overflow in AD Authentication Service Allows Pre-Authentication Remote Code Execution
A heap-based buffer overflow vulnerability in the Fireware OS authentication service allows an attacker who controls or intercepts traffic to the configured Active Directory server to create a denial of service condition and potentially execute arbitrary code by returning a specially crafted response.
References
- https://psirt.watchguard.com/CVE-2026-112709 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-122Heap-based Buffer Overflow
CWE-131Incorrect Calculation of Buffer Size
CWE-787Out-of-bounds Write
Timeline
Published27 Oct 2026
Updated27 Oct 2026
First seen27 Oct 2026
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