CVE-2026-4254 Tenda AC8 HTTP Endpoint SysToolChangePwd doSystemCmd stack-based overflow

Critical 9.3 Published 16 Mar 2026 Updated 16 Mar 2026

A remote attacker can trigger a stack-based buffer overflow in the Tenda AC8 router's password change endpoint, potentially leading to arbitrary code execution.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-4254?

CVE-2026-4254 is a critical memory corruption vulnerability in Tenda Ac8 Firmware, published on 16 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A weakness has been identified in Tenda AC8 up to 16.03.50.11. This vulnerability affects the function doSystemCmd of the file /goform/SysToolChangePwd of the component HTTP Endpoint. This manipulation of the argument local_2c causes stack-based buffer overflow. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks.

Weakness: CWE-121, CWE-787, CWE-119

Which versions are affected by CVE-2026-4254?

It affects 1 product.

Products include Tenda Ac8 Firmware.

How do I fix CVE-2026-4254?

No fix has been published for CVE-2026-4254 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-2026-4254 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4254 exists.

All Tenda Ac8 Firmware vulnerabilities

Sources

Also known as GHSA-7ppq-fx8r-g889.