CVE-2024-6343 Memory corruption in ATP series firmware

Medium 4.9 Published 3 Sep 2024 Updated 3 Sep 2024

An authenticated administrator can cause a denial of service on Zyxel firewalls by sending a crafted HTTP request that triggers a buffer overflow.

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

What is CVE-2024-6343?

CVE-2024-6343 is a medium-severity memory corruption vulnerability in Zyxel ATP series firmware, published on 3 Sep 2024. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

A buffer overflow vulnerability in the CGI program of Zyxel ATP series firmware versions from V4.32 through V5.38, USG FLEX series firmware versions from V4.50 through V5.38, USG FLEX 50(W) series firmware versions from V4.16 through V5.38, and USG20(W)-VPN series firmware versions from V4.16 through V5.38 could allow an authenticated attacker with administrator privileges to cause denial of service (DoS) conditions by sending a crafted HTTP request to a vulnerable device.

Weakness: CWE-120

Which versions are affected by CVE-2024-6343?

It affects 1 product.

Products include Zyxel Zld.

How do I fix CVE-2024-6343?

No fix has been published for CVE-2024-6343 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-2024-6343 being exploited?

There is no known exploitation of CVE-2024-6343 in the wild and no public exploit code.

Sources

Also known as GHSA-49fx-5cmv-3mw7.