CVE-2023-4473

Zyxel Nas326 Firmware command injection

9.8 CRITICALEPSS 41.3%

Published30 Nov 2023

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.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Affected products

Zyxel Nas326 Firmware≤ 5.21\(aazf.14\)c0

Zyxel Nas542 Firmware≤ 5.21\(abag.11\)c0

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

Frequently asked

Is CVE-2023-4473 being actively exploited?

CVE-2023-4473 is not in the CISA KEV catalog. Its EPSS exploit probability is 41.3%.

How severe is CVE-2023-4473?

CVE-2023-4473 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 41.3% probability of exploitation.

Which products are affected by CVE-2023-4473?

Affected products include Zyxel Nas326 Firmware, Zyxel Nas542 Firmware.

How do I fix CVE-2023-4473?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2023-4473 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation works Book a demo

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.