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CVE-2023-27992

KEVZyxel Multiple NAS Devices Command Injection Vulnerability
Description

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.

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.

CVSS 3.1 vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
PublishedJun 19, 2023
Last modifiedJun 17, 2026
Added to KEVJun 23, 2023
Remediation dueJul 14, 2023
References
0 recent articles mention this CVE
    87
    Risk assessment · Critical

    Actively exploited. Patch immediately.

    Exploitation
    Confirmed in the wild (CISA KEV)
    Federal remediation deadline
    Overdue by 1201 days
    CVSS
    9.8 CRITICAL
    EPSS (30-day exploit probability)
    82.3% · top 1% of all CVEs
    Weakness
    CWE-78
    Attack vector
    Network, remotely reachable
    Preconditions
    No privileges and no user interaction
    Recommended actions
    1. 1.Apply updates per vendor instructions.
    2. 2.Treat as emergency change: patch or isolate internet-facing instances first.
    3. 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
    4. 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.

    Assessment is derived automatically from the live signals above; verify against your own asset inventory.