CVE-2023-27992

CRITICAL KEV

Zyxel Nas326 Firmware < 5.21\(aazf.14\)c0 - OS Command Injection

Title source: rule

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.

References (2)

[Patch, Vendor Advisory] https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products

[US Government Resource] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-27992

Scores

CVSS v3 9.8

EPSS 0.8653

EPSS Percentile 99.4%

Attack Vector NETWORK

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

Details

CISA KEV 2023-06-23

VulnCheck KEV 2023-06-23

InTheWild.io 2023-06-23

ENISA EUVD EUVD-2023-31717

CWE

CWE-78

Status published

Products (3)

zyxel/nas326_firmware < 5.21\(aazf.14\)c0

zyxel/nas540_firmware < 5.21\(aatb.11\)c0

zyxel/nas542_firmware < 5.21\(abag.11\)c0

Published Jun 19, 2023

KEV Added Jun 23, 2023

Tracked Since Feb 18, 2026