CVE-2026-4042 Tenda i12 WifiMacFilterGet formWifiMacFilterGet stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the Tenda i12 router's WifiMacFilterGet function, potentially leading to code execution or denial of service.
- 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-2026-4042?
CVE-2026-4042 is a high-severity memory corruption vulnerability in Tenda i12, 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 i12 1.0.0.6(2204). The affected element is the function formWifiMacFilterGet of the file /goform/WifiMacFilterGet. This manipulation of the argument index causes stack-based buffer overflow. The attack may be initiated remotely. The exploit has been made available to the public and could be used for attacks.
Which versions are affected by CVE-2026-4042?
It affects 1 product.
Products include Tenda I12 Firmware.
How do I fix CVE-2026-4042?
No fix has been published for CVE-2026-4042 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-2026-4042 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4042 exists.
Other vulnerabilities in Tenda i12
- CVE-2025-25676 Memory corruption in n/a
- CVE-2025-25678 Memory corruption in n/a
- CVE-2026-5609 Tenda i12 Parameter wifiSSIDset formwrlSSIDset stack-based overflow
- CVE-2026-4041 Tenda i12 exeCommand vos_strcpy stack-based overflow
- CVE-2026-4043 Tenda i12 wifiSSIDget formwrlSSIDget stack-based overflow
Sources
Also known as GHSA-wmx5-6ccw-8g4h.