CVE-2026-5609 Tenda i12 Parameter wifiSSIDset formwrlSSIDset stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the Tenda i12 router's Wi-Fi SSID parameter handler, 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-2026-5609?
CVE-2026-5609 is a high-severity memory corruption vulnerability in Tenda i12, published on 6 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A flaw has been found in Tenda i12 1.0.0.11(3862). Affected by this vulnerability is the function formwrlSSIDset of the file /goform/wifiSSIDset of the component Parameter Handler. This manipulation of the argument index/wl_radio causes stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been published and may be used.
Which versions are affected by CVE-2026-5609?
It affects 1 product.
Products include Tenda I12 Firmware.
How do I fix CVE-2026-5609?
No fix has been published for CVE-2026-5609 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-2026-5609 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5609 exists.
Other vulnerabilities in Tenda i12
- CVE-2025-25676 Memory corruption in n/a
- CVE-2025-25678 Memory corruption in n/a
- CVE-2026-4041 Tenda i12 exeCommand vos_strcpy stack-based overflow
- CVE-2026-4042 Tenda i12 WifiMacFilterGet formWifiMacFilterGet stack-based overflow
- CVE-2026-4043 Tenda i12 wifiSSIDget formwrlSSIDget stack-based overflow
Sources
Also known as GHSA-26hh-9qh7-grjv.