CVE-2022-40855 Memory corruption in n/a

Critical 9.8 Published 23 Sep 2022 Updated 22 May 2025

Attackers can trigger a stack overflow in the Tenda W20E router to achieve remote code execution or cause a denial of service.

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-2022-40855?

CVE-2022-40855 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 contains a stack overflow in the function formSetPortMapping with post request 'goform/setPortMapping/'. This vulnerability allows attackers to cause a Denial of Service (DoS) or Remote Code Execution (RCE) via the portMappingServer, portMappingProtocol, portMappingWan, porMappingtInternal, and portMappingExternal parameters.

Weakness: CWE-787

Which versions are affected by CVE-2022-40855?

It affects 1 product.

Products include Tenda W20e Firmware.

How do I fix CVE-2022-40855?

No fix has been published for CVE-2022-40855 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-2022-40855 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-40855 exists.

Sources

Also known as GHSA-526f-868j-w52f.