CVE-2026-3975 Tenda W3 POST Parameter WifiMacFilterGet formWifiMacFilterGet stack-based overflow

High 8.7 Published 12 Mar 2026 Updated 12 Mar 2026

Remote attackers can trigger a stack-based buffer overflow in the Tenda W3 router via the WifiMacFilterGet POST parameter, potentially leading to code execution.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-3975?

CVE-2026-3975 is a high-severity memory corruption vulnerability in Tenda W3, published on 12 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A security flaw has been discovered in Tenda W3 1.0.0.3(2204). This issue affects the function formWifiMacFilterGet of the file /goform/WifiMacFilterGet of the component POST Parameter Handler. Performing a manipulation of the argument wl_radio results in stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been released to the public and may be used for attacks.

Weakness: CWE-121, CWE-787, CWE-119

Which versions are affected by CVE-2026-3975?

It affects 1 product.

Products include Tenda W3 Firmware.

How do I fix CVE-2026-3975?

No fix has been published for CVE-2026-3975 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-3975 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3975 exists.

Sources

Also known as GHSA-r9cv-9j6h-2cv2.