CVEvulnerability

CVE-2023-27992

9.8 CRITICAL Known exploited Published 2023-06-19 Modified 2026-06-17 Official page ↗

CISA Known Exploited Vulnerability

Zyxel Multiple NAS Devices Command Injection Vulnerability — Zyxel Multiple Network-Attached Storage (NAS) Devices

Multiple Zyxel network-attached storage (NAS) devices contain a pre-authentication command injection vulnerability that could allow an unauthenticated attacker to execute commands remotely via a crafted HTTP request.

Added to KEV
2023-06-23
Remediation due
2023-07-14
Ransomware use
Unknown
Required action
Apply updates per vendor instructions.
Notes
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products; https://nvd.nist.gov/vuln/detail/CVE-2023-27992
Status
Analyzed
Published
2023-06-19
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-78

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.

Affected configurations

• zyxel nas326 firmware (< 5.21\(aazf.14\)c0) • zyxel nas540 firmware (< 5.21\(aatb.11\)c0) • zyxel nas542 firmware (< 5.21\(abag.11\)c0)

Related

Weakness · CWE (1)

  • CWE-78 Improper Neutralization of Special Elements used in an OS Command weakness

References