CVE-2023-4473

Severity

CRITICAL

CVSS

9.8

EPSS

0.41348

Risk score

53.67

CISA KEV

PoC

Published

2023-11-30

Modified

2025-12-16

First seen

2026-08-07

Aliases

EUVD-2023-54328, GHSA-2H5J-5QMH-V4QH

Products

Zyxel:NAS326 firmware V5.21(AAZF.14)C0, Zyxel:NAS542 firmware V5.21(ABAG.11)C0

Sources

euvd EUVD-2023-54328

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

https://euvd.enisa.europa.eu/vulnerability/EUVD-2023-54328
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-authentication-bypass-and-command-injection-vulnerabilities-in-nas-products
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/