CVE-2022-40866 Memory corruption in n/a

Critical 9.8 Published 23 Sep 2022 Updated 22 May 2025

A stack overflow in the Tenda W20E router allows attackers to execute arbitrary code or cause a denial of service via a crafted request.

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-2022-40866?

CVE-2022-40866 is a critical memory corruption vulnerability in n/a, published on 23 Sep 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Tenda W20E router V15.11.0.6 (US_W20EV4.0br_V15.11.0.6(1068_1546_841)_CN_TDC) contains a stack overflow vulnerability in the function formSetDebugCfg with request /goform/setDebugCfg/

Weakness: CWE-787

Which versions are affected by CVE-2022-40866?

It affects 1 product.

Products include Tenda W20e Firmware.

How do I fix CVE-2022-40866?

No fix has been published for CVE-2022-40866 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-2022-40866 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-40866 exists.

Sources

Also known as GHSA-986h-37wj-r876.