CVE-2021-20166 Memory corruption in Netgear RAX43

High 8.8 Published 30 Dec 2021 Updated 3 Aug 2024

A buffer overrun in the URL parsing functionality of Netgear RAX43 routers allows attackers to redirect control flow, potentially leading to arbitrary code execution.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-20166?

CVE-2021-20166 is a high-severity memory corruption vulnerability in Netgear RAX43, published on 30 Dec 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Netgear RAX43 version 1.0.3.96 contains a buffer overrun vulnerability. The URL parsing functionality in the cgi-bin endpoint of the router containers a buffer overrun issue that can redirection control flow of the applicaiton.

Weakness: CWE-120

Which versions are affected by CVE-2021-20166?

It affects 1 product.

Products include Netgear Rax43 Firmware.

How do I fix CVE-2021-20166?

No fix has been published for CVE-2021-20166 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-2021-20166 being exploited?

There is no known exploitation of CVE-2021-20166 in the wild and no public exploit code.

Sources

Also known as GHSA-756v-gg77-ccw5.