CVE-2023-4473

CRITICAL EXPLOITED

Zyxel NAS326/NAS542 < 5.21(AAZF.14)C0/5.21(ABAG.11)C0 - Unauthenticated OS Command Injection

Title source: llm

Exploitation Summary

CVE-2023-4473 has been observed exploited in the wild (reported by VulnCheck KEV).

Description

A command injection vulnerability in the web server 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 URL to a vulnerable device.

References (2)

Core 2

Core References

Various Sources

https://bugprove.com/knowledge-hub/cve-2023-4473-and-cve-2023-4474-authentication-bypass-and-multiple-blind-os-command-injection-vulnerabilities-in-zyxel-s-nas-326-devices/

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 0.3292

EPSS Percentile 97.0%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation poc

Automatable yes

Technical Impact total

Details

VulnCheck KEV 2024-04-28

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