CVE-2023-35138

CRITICAL

Zyxel NAS326 & NAS542 < 5.21(aazf.14)c0 & < 5.21(abag.11)c0 - Unauthenticated OS Command Injection

Title source: llm

Description

A command injection vulnerability in the “show_zysync_server_contents” function of the Zyxel NAS326 firmware version V5.21(AAZF.14)C0 and NAS542 firmware version V5.21(ABAG.11)C0 could allow an unauthenticated attacker to execute some operating system (OS) commands by sending a crafted HTTP POST request.

References (1)

Core 1

Core References

Patch, Vendor Advisory vendor-advisory

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-authentication-bypass-and-command-injection-vulnerabilities-in-nas-products

Scores

CVSS v3 9.8

EPSS 0.0960

EPSS Percentile 93.0%

Attack Vector NETWORK

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

Details

CWE

CWE-78

Status published

Products (2)

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

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

Published Nov 30, 2023

Tracked Since Feb 18, 2026