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Status published
Critical
CVE-2023-27992
The pre-authentication command injection vulnerability in the Zyxel NAS326 firmware...
Vulnerability 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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
No credits recorded in the NVD database.
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Affected Vendor
Zyxel
View all reports →Affected Software
NAS326 firmware, NAS540 firmware, NAS542 firmware
Vulnerable Versions:
< V5.21(AAZF.14)C0, < V5.21(AATB.11)C0, < V5.21(ABAG.11)C0
Timeline
Official Publish:
June 19th, 2023
Last Modified:
October 21st, 2025
Added to House:
July 22nd, 2026
CVSS Vectors
V3:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H