CVE-2023-4474

The improper neutralization of special elements in the WSGI server of the Zyxel NAS326 firmware...

9.8 Critical

The improper neutralization of special elements in the WSGI 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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

29.7%Up 29.6 points since Dec 1, 2023

What each source reports

CVE List Score used 9.8

Record: CVE-2023-4474
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-78
Updated: 2026-11-02

EUVDEUVD-2023-54329 9.8

Record: EUVD-2023-54329
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-h9w9-8x3q-c9vg 9.8

The improper neutralization of special elements in the WSGI server of the Zyxel NAS326 firmware...

Record: GHSA-h9w9-8x3q-c9vg
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-78
Updated: 2026-11-02

NVD 9.8

Record: CVE-2023-4474
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-78
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2023-4474 is a critical vulnerability (CVSS 9.8) in Zyxel Nas326 Firmware, published November 30, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 29.7%, the 98th percentile. No source names a fixed version.