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

Source: https://junglewise.ai/threats/cve-2023-27992-zyxel-multiple-nas-devices-command-injection-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2023-06-23. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

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](https://junglewise.ai/threats/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

## Related threats

- [Zyxel Multiple NAS Devices OS Command Injection Vulnerability](https://junglewise.ai/threats/cve-2020-9054-zyxel-multiple-nas-devices-os-command-injection-vulnerability)