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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:Jun 19, 2023
    Last Modified:Oct 27, 2025
    EPS:Jun 19, 2023
    EPSS Score:0.87891
    CVSS Score:9.8

    CISA Notification

    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.

    Required Action:

    Apply updates per vendor instructions.

    Notes:

    No extra notes provided.

    Due Date
    Jul 14, 2023
    1155 days ago
    Alert Date
    Jun 23, 2023
    1176 days ago

    Affected Products

    Vendor
    Zyxel
    Product
    Nas326
    Vendor
    Zyxel
    Product
    Nas326 Firmware
    Vendor
    Zyxel
    Product
    Nas540
    Vendor
    Zyxel
    Product
    Nas540 Firmware
    Vendor
    Zyxel
    Product
    Nas542
    Vendor
    Zyxel
    Product
    Nas542 Firmware

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2024-29972 (CVSS 9.8) — ** UNSUPPORTED WHEN ASSIGNED ** The command injection vulnerability in the CGI program "remote_help-cgi" in Zy…
    CVE-2023-5372 (CVSS 7.2) — The post-authentication command injection vulnerability in Zyxel NAS326 firmware versions through V5.21(AAZF.1…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High