CVE-2023-27992

Zyxel NAS326 firmware, Zyxel NAS540 firmware, Zyxel NAS542 firmware

Published 19 Jun 2023 · updated 17 Jun 2026 · Analyzed

9.8 Critical · CVSS 3.1, zyxel.com.tw

Exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on 23 Jun 2023, with a remediation deadline of 14 Jul 2023 for US federal agencies.

Required action: Apply updates per vendor instructions.

Description

The pre-authentication command injection vulnerability in the Zyxel NAS326 firmware versions prior to V5.21(AAZF.14)C0, NAS540 firmware versions prior to V5.21(AATB.11)C0, and NAS542 firmware versions prior to V5.21(ABAG.11)C0 could allow an unauthenticated attacker to execute some operating system (OS) commands remotely by sending a crafted HTTP request.

References

www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products · Patch, Vendor Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-27992 · US Government Resource