9.8

CVE-2023-27992

Warning

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.

Data is provided by the National Vulnerability Database (NVD)
Zyxel ≫ Nas326 Firmware Version < 5.21\(aazf.14\)c0
   Zyxel ≫ Nas326 Version-
Zyxel ≫ Nas540 Firmware Version < 5.21\(aatb.11\)c0
   Zyxel ≫ Nas540 Version-
Zyxel ≫ Nas542 Firmware Version < 5.21\(abag.11\)c0
   Zyxel ≫ Nas542 Version-

23.06.2023: CISA Known Exploited Vulnerabilities (KEV) Catalog

Zyxel Multiple NAS Devices Command Injection Vulnerability

Vulnerability

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.

Description

Apply updates per vendor instructions.

Required actions
EPSS Metriken
Type Source Score Percentile
EPSS FIRST.org 86.39% 0.994
CVSS Metriken
Source Base Score Exploit Score Impact Score Vector string
security@zyxel.com.tw 9.8 3.9 5.9
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.