CVE-2023-4397 Memory corruption in USG FLEX 50(W) series firmware
An authenticated administrator can cause a denial-of-service condition on Zyxel firewalls by executing CLI commands with crafted strings.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-4397?
CVE-2023-4397 is a medium-severity memory corruption vulnerability in Zyxel USG FLEX 50(W) series firmware, published on 28 Nov 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A buffer overflow vulnerability in the Zyxel ATP series firmware version 5.37, USG FLEX series firmware version 5.37, USG FLEX 50(W) series firmware version 5.37, and USG20(W)-VPN series firmware version 5.37, could allow an authenticated local attacker with administrator privileges to cause denial-of-service (DoS) conditions by executing the CLI command with crafted strings on an affected device.
Weakness: CWE-120
Which versions are affected by CVE-2023-4397?
It affects 1 product.
Products include Zyxel Zld.
How do I fix CVE-2023-4397?
No fix has been published for CVE-2023-4397 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-2023-4397 being exploited?
There is no known exploitation of CVE-2023-4397 in the wild and no public exploit code.
Other vulnerabilities in Zyxel USG FLEX 50(W) series firmware
Sources
Also known as GHSA-rx6q-hj2g-x8wp.