CVE-2023-35138

Zyxel Nas326 Firmware command injection

9.8 CRITICALEPSS 40.0%

Published30 Nov 2023

Description

A command injection vulnerability in the “show_zysync_server_contents” function 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 HTTP POST request.

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-2023-35138 being actively exploited?

CVE-2023-35138 is not in the CISA KEV catalog. Its EPSS exploit probability is 40.0%.

How severe is CVE-2023-35138?

CVE-2023-35138 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 40.0% probability of exploitation.

Which products are affected by CVE-2023-35138?

Affected products include Zyxel Nas326 Firmware, Zyxel Nas542 Firmware.

How do I fix CVE-2023-35138?

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-2023-35138 against the real software inventory on every managed device, every day. 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.

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