CVE-2023-4473

Name: CVE-2023-4473
Creator: NVD / NIST
Published: 2023-11-30T02:15:43.347+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 41.35%

Last modified Jun 17, 2026

CVE-2023-4473 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 41.35% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

41.35%

98.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Zyxel	Nas326 Firmware	<= 5.21\(aazf.14\)c0
Zyxel	Nas542 Firmware	<= 5.21\(abag.11\)c0

References

Timeline

Published: Nov 30, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-4473?

How severe is CVE-2023-4473?

CVE-2023-4473 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 41.35% probability of exploitation in the next 30 days.

How do I fix CVE-2023-4473?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-4473?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST