CVE-2023-27992: Zyxel Multiple NAS Devices Command Injection Vulnerability

CVE-2023-27992 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2023-06-23

Multiple Zyxel NAS devices contain a pre-authentication command injection vulnerability in their firmware. An unauthenticated remote attacker can execute arbitrary operating system commands by sending a specially crafted HTTP request to the affected device.

Vendors: Zyxel.

Quick answers

Is CVE-2023-27992 exploited in the wild?
Yes. CVE-2023-27992 is known to be exploited in the wild, first recorded on 23 June 2023. Treat it as urgent.
How severe is CVE-2023-27992?
Critical severity, with a CVSS score of 9.8, published 23 June 2023.
Which products and versions are affected?
Zyxel NAS326 firmware prior to V5.21(AAZF.14)C0; Zyxel NAS540 firmware prior to V5.21(AATB.11)C0; Zyxel NAS542 firmware prior to V5.21(ABAG.11)C0.
Is there a fix for CVE-2023-27992?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2023-27992 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2023-27992?
Check whether you run Zyxel Multiple Network-Attached Storage (NAS) Devices. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Zyxel NAS326 firmware prior to V5.21(AAZF.14)C0
  • Zyxel NAS540 firmware prior to V5.21(AATB.11)C0
  • Zyxel NAS542 firmware prior to V5.21(ABAG.11)C0

Timeline

  • 2023-06-19: disclosed: NVD Published Date
  • 2023-06-23: kev added: Date added to CISA Known Exploited Vulnerabilities Catalog
  • 2023-06-23: exploited: Reported as exploited in the wild

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