CRITICAL🚩 CISA KEV⚡ EXPLOIT✓ PATCH🇵🇱 Wersja polska

CVE-2023-27992

CVSS 9.8v3.1pub. 2023-06-19upd. 2025-10-27

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.

🇵🇱 Read Polish description →

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Zyxel Nas326
HW
Zyxel
all versions
Zyxel Nas326 Firmware
OS
Zyxel
< 5.21\(aazf.14\)c0
Zyxel Nas540
HW
Zyxel
all versions
Zyxel Nas540 Firmware
OS
Zyxel
< 5.21\(aatb.11\)c0
Zyxel Nas542
HW
Zyxel
all versions
Zyxel Nas542 Firmware
OS
Zyxel
< 5.21\(abag.11\)c0

CISA KEV — detailsi

Vendori: Zyxel
Producti: Multiple Network-Attached Storage (NAS) Devices
Added to KEVi: June 23, 2023
Remediation deadline (US Federal)i: July 14, 2023(overdue)

🇺🇸CISA KEV (original)↗

Required action (CISA)i

Apply updates per vendor instructions.

CISA descriptioni

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.

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