Zyxel security advisory for LPE and authenticated directory traversal vulnerabilities of firewalls

Zyxel_May Posts: 127  Ally Member
First Anniversary First Comment
edited July 2022 in Security Advisories

CVE: CVE-2022-30526CVE-2022-2030


Zyxel has released patches for products affected by local privilege escalation (LPE) and authenticated directory traversal vulnerabilities. Users are advised to install them for optimal protection.

What are the vulnerabilities?


A privilege escalation vulnerability was identified in the CLI command of some firewall versions that could allow a local attacker to execute some OS commands with root privileges in some directories on a vulnerable device.


An authenticated directory traversal vulnerability caused by specific character sequences within an improperly sanitized URL was identified in some CGI programs of some firewall versions.

What versions are vulnerable-and what should you do?

After a thorough investigation, we’ve identified the vulnerable products for CVE-2022-30526 and CVE-2022-2030 that are within their vulnerability support period, with their firmware patches shown in the table below.

Affected model

Affected version

Patch availability



USG FLEX 100(W), 200, 500, 700

ZLD V4.50~V5.30

ZLD V4.50~V5.30

ZLD V5.31


ZLD V4.16~V5.30

ZLD V4.20~V5.30

ZLD V5.31

ATP series

ZLD V4.32~V5.30

ZLD V4.32~V5.30

ZLD V5.31

VPN series

ZLD V4.30~V5.30

ZLD V4.30~V5.30

ZLD V5.31


ZLD V4.09~V4.72

ZLD V4.20~V4.72

ZLD V4.72 week28

Got a question?

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


Thanks to the following security consultancies for reporting the issues to us:

  • Rapid7 for CVE-2022-30526
  • Maurizio Agazzini (HN Security) in collaboration with SSD Secure Disclosure for CVE-2022-2030

Revision history

2022-07-19: Initial release

2022-07-28: Updated the affected version of USG FLEX 50(W) / USG20(W)-VPN and USG/ZyWALL and added the patch download link for USG/ZyWALL 


  • copossum
    copossum Posts: 11  Freshman Member
    First Anniversary First Comment
    how would one go about getting a patch for a USG40 running 4.72(AALA.0)? How do I "reach out to my local Zyxel support team" fot the file?

    I am in located in Europe/Austria.

    or will a regular Firmware update be available shortly?

    thank you
  • dkyeager
    dkyeager Posts: 69  Ally Member
    First Anniversary 10 Comments Friend Collector
    This gets extremely tiring.  While I am glad these exploits are being discovered and patched, I would rather have then uncovered before general release.
  • mMontana
    mMontana Posts: 1,337  Guru Member
    First Anniversary 10 Comments Friend Collector First Answer
    No link for 4.x devices.
    No official firmwares available for 4.x devices.