CVE-2026-3976 Tenda W3 POST Parameter WifiMacFilterSet formWifiMacFilterSet stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the Tenda W3 router via crafted POST parameters, 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-2026-3976?
CVE-2026-3976 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 weakness has been identified in Tenda W3 1.0.0.3(2204). Impacted is the function formWifiMacFilterSet of the file /goform/WifiMacFilterSet of the component POST Parameter Handler. Executing a manipulation of the argument index/GO can lead to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been made available to the public and could be used for attacks.
Which versions are affected by CVE-2026-3976?
It affects 1 product.
Products include Tenda W3 Firmware.
How do I fix CVE-2026-3976?
No fix has been published for CVE-2026-3976 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-2026-3976 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3976 exists.
Other vulnerabilities in Tenda W3
- CVE-2026-3972 Tenda W3 HTTP setcfm formSetCfm stack-based overflow
- CVE-2026-3973 Tenda W3 POST Parameter setAutoPing formSetAutoPing stack-based overflow
- CVE-2026-3974 Tenda W3 HTTP exeCommand formexeCommand stack-based overflow
- CVE-2026-3975 Tenda W3 POST Parameter WifiMacFilterGet formWifiMacFilterGet stack-based overflow
- CVE-2026-4007 Tenda W3 POST Parameter wifiSSIDget stack-based overflow
Sources
Also known as GHSA-956f-fcv4-hgpq.