CVE-2023-27992

Published: Jun 19, 2023Updated: Oct 27, 2025 Sources: CVE List NVD BDUCWE-78

9.8CRITICAL

NVD MITRE

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:HAvailability

High

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Weaknesses

CWE-78

Affected Products

Zyxel Communications Corp.

commercial·TWaka zyxel

NAS326 firmware

Networking Infrastructure

NAS540 firmware

Networking Infrastructure

NAS542 firmware

Networking Infrastructure

NAS326

Networking Infrastructure

NAS540

Networking Infrastructure

NAS542

Networking Infrastructure

and 3 more affected products View all →

Exploitability

CISA Known Exploited Vulnerability

Added to KEV:Jun 23, 2023

Remediation due:Jul 14, 2023

Required action: Apply updates per vendor instructions.

Official Patch Available

Is your org exposed to CVE-2023-27992?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Execution

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References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products

zyxel.com

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-27992

cisa.gov

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