CVE-2022-43391 Memory corruption in NR7101 firmware

Medium 6.5 Published 11 Jan 2023 Updated 15 Oct 2024

An authenticated attacker can cause denial-of-service on Zyxel NR7101 devices by sending a crafted HTTP request to a CGI program.

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-2022-43391?

CVE-2022-43391 is a medium-severity memory corruption vulnerability in Zyxel NR7101 firmware, published on 11 Jan 2023. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A buffer overflow vulnerability in the parameter of the CGI program in Zyxel NR7101 firmware prior to V1.15(ACCC.3)C0, which could allow an authenticated attacker to cause denial-of-service (DoS) conditions by sending a crafted HTTP request.

Weakness: CWE-120

Which versions are affected by CVE-2022-43391?

It affects 48 products.

Products include Zyxel Ax7501-B0 Firmware, Zyxel Dx3301-T0 Firmware, Zyxel Dx4510-B1 Firmware, Zyxel Dx5401-B0 Firmware, Zyxel Emg3525-T50b Firmware, Zyxel Emg5523-T50b Firmware and 42 more.

How do I fix CVE-2022-43391?

No fix has been published for CVE-2022-43391 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-2022-43391 being exploited?

There is no known exploitation of CVE-2022-43391 in the wild and no public exploit code.

Sources

Also known as GHSA-6fjf-x8wx-cw7h.