Zyxel security advisory for format string vulnerability in NAS

Zyxel security advisory for format string vulnerability in NAS

CVE: CVE-2022-34747

Summary

Zyxel has released patches for NAS products affected by a format string vulnerability. Users are advised to install them for optimal protection.

What is the vulnerability?

A format string vulnerability was found in a specific binary of Zyxel NAS products that could allow an attacker to achieve unauthorized remote code execution via a crafted UDP packet.

What versions are vulnerable—and what should you do?

After a thorough investigation, we have identified the vulnerable products that are within their vulnerability support period, with their firmware patches shown in the table below.

Got a question?

Please contact your local service rep or visit Zyxel’s forum for further information or assistance.

Acknowledgment

Thanks to Shaposhnikov Ilya for reporting the issue to us.

Revision history

2022-09-06: Initial release.