Vulnerability Monitor

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CVE-2023-27992

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.

Published

2023-06-19T12:15:09.433

Last Modified

2025-10-27T17:05:04.283

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 9.8 (CRITICAL)

Weaknesses

Type: Secondary
CWE-78
Type: Primary
CWE-78

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	zyxel	nas326_firmware	< 5.21\(aazf.14\)c0	Yes
Hardware	zyxel	nas326	-	No
Operating System	zyxel	nas540_firmware	< 5.21\(aatb.11\)c0	Yes
Hardware	zyxel	nas540	-	No
Operating System	zyxel	nas542_firmware	< 5.21\(abag.11\)c0	Yes
Hardware	zyxel	nas542	-	No

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products Patch, Vendor Advisory ([email protected])
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-27992 US Government Resource (134c704f-9b21-4f2e-91b3-4a467353bcc0)