CVE-2023-37927 Command injection in NAS326 firmware

High 8.8 Published 30 Nov 2023 Updated 13 Feb 2025

An authenticated attacker can execute arbitrary OS commands on Zyxel NAS devices by sending a crafted URL to the 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-2023-37927?

CVE-2023-37927 is a high-severity command injection vulnerability in Zyxel NAS326 firmware, published on 30 Nov 2023. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

The improper neutralization of special elements in the CGI program of the Zyxel NAS326 firmware version V5.21(AAZF.14)C0 and NAS542 firmware version V5.21(ABAG.11)C0 could allow an authenticated attacker to execute some operating system (OS) commands by sending a crafted URL to a vulnerable device.

Weakness: CWE-78

Which versions are affected by CVE-2023-37927?

It affects 2 products.

Products include Zyxel Nas326 Firmware, Zyxel Nas542 Firmware.

How do I fix CVE-2023-37927?

No fix has been published for CVE-2023-37927 yet. Limit exposure of the affected software until one is available.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2023-37927 being exploited?

There is no known exploitation of CVE-2023-37927 in the wild and no public exploit code.

Sources

Also known as GHSA-rxh8-p4v2-m8hf.