Zyxel security advisory for OS command injection vulnerability of firewalls

CVE: CVE-2023-28771

Summary

Zyxel has released patches for an OS command injection vulnerability found by TRAPA Security and urges users to install them for optimal protection.

What is the vulnerabilities?

Improper error message handling in some firewall versions could allow an unauthenticated attacker to execute some OS commands remotely by sending crafted packets to an affected device.

What versions are vulnerable—and what should you do?

After a thorough investigation, we’ve identified the vulnerable products that are within their vulnerability support period and released patches to address the vulnerability, as shown in the table below.