CVE-2026-3974 Tenda W3 HTTP exeCommand formexeCommand stack-based overflow
A remote attacker can trigger a stack-based buffer overflow in the Tenda W3 router's HTTP handler to execute arbitrary code.
- 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-2026-3974?
CVE-2026-3974 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 vulnerability was identified in Tenda W3 1.0.0.3(2204). This vulnerability affects the function formexeCommand of the file /goform/exeCommand of the component HTTP Handler. Such manipulation of the argument cmdinput leads to stack-based buffer overflow. The attack may be performed from remote. The exploit is publicly available and might be used.
Which versions are affected by CVE-2026-3974?
It affects 1 product.
Products include Tenda W3 Firmware.
How do I fix CVE-2026-3974?
No fix has been published for CVE-2026-3974 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-2026-3974 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3974 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-2026-3975 Tenda W3 POST Parameter WifiMacFilterGet formWifiMacFilterGet stack-based overflow
- CVE-2026-3976 Tenda W3 POST Parameter WifiMacFilterSet formWifiMacFilterSet stack-based overflow
- CVE-2026-4007 Tenda W3 POST Parameter wifiSSIDget stack-based overflow
Sources
Also known as GHSA-45rr-9399-9pp6.