CVE-2026-3803 Tenda i3 WifiMacFilterGet formWifiMacFilterGet stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the Tenda i3 router's WifiMacFilterGet function, potentially leading to code execution or service disruption.
- 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-2026-3803?
CVE-2026-3803 is a high-severity memory corruption vulnerability in Tenda i3, published on 9 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 i3 1.0.0.6(2204). This affects the function formWifiMacFilterGet of the file /goform/WifiMacFilterGet. The manipulation of the argument index leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit is publicly available and might be used.
Which versions are affected by CVE-2026-3803?
It affects 1 product.
Products include Tenda I3 Firmware.
How do I fix CVE-2026-3803?
No fix has been published for CVE-2026-3803 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-2026-3803 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3803 exists.
Other vulnerabilities in Tenda i3
- CVE-2026-3970 Tenda i3 wifiSSIDget formwrlSSIDget stack-based overflow
- CVE-2026-3971 Tenda i3 wifiSSIDset formwrlSSIDset stack-based overflow
- CVE-2026-3799 Tenda i3 setcfm formSetCfm stack-based overflow
- CVE-2026-3801 Tenda i3 setAutoPing formSetAutoPing stack-based overflow
- CVE-2026-3802 Tenda i3 exeCommand formexeCommand stack-based overflow
Sources
Also known as GHSA-9r9x-93jv-xc8p.