Zyxel security advisory for pre-configured password vulnerability of LTE3301-M209

CVE: CVE-2022-40602


Zyxel has released a patch for its LTE indoor router LTE3301-M209 to address a pre-configured password vulnerability. Users are advised to install the patch for optimal protection.

What is the vulnerability?

A flaw in the previous LTE3301-M209 firmware could allow a remote attacker to access the device using an improper pre-configured password if the remote administration feature has been enabled by an authenticated administrator.

What versions are vulnerable—and what should you do?

After a thorough investigation, we’ve found that the root cause existed in pre-configured code provided by our vendor and affected only one product still within its vulnerability support period. We’ve released a firmware patch to address the issue, as shown in the table below.

Affected model Affected version Patch availability
LTE3301-M209 V1.00(ABLG.4)C0 and earlier V1.00(ABLG.6)C0

Please note that the LTE3301-Plus currently on the market is NOT affected because it is built on a different code base.

If an on-market product is not listed above, it is NOT affected.

Got a question?

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


Thanks to RE-Solver for reporting the issue to us.

Revision history

2022-11-22: Initial release.