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Qnap QTS and QuTS hero NULL Pointer Dereference (CVE-2025-66281)

high Tenable OT Security Plugin ID 505902

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions. The remote attackers can then exploit the vulnerability to launch a denial-of-service (DoS) attack.
We have already fixed the vulnerability in the following versions: QTS 5.2.9.3410 build 20260214 and later QuTS hero h5.2.9.3410 build 20260214 and later QuTS hero h5.3.4.3500 build 20260520 and later QuTS hero h6.0.0.3397 build 20260206 and later

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

Refer to the vendor advisory.

See Also

https://www.qnap.com/en/security-advisory/qsa-26-10

Plugin Details

Severity: High

ID: 505902

File Name: tenable_ot_qnap_CVE-2025-66281.nasl

Version: 1.1

Type: Remote

Family: Tenable.ot

Published: 7/31/2026

Updated: 7/31/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.98

CVSS v3

Risk Factor: High

Base Score: 7.2

Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Vulnerability Information

CPE: cpe:/o:qnap:qts, cpe:/o:qnap:quts_hero:h5, cpe:/o:qnap:quts_hero:h6

Required KB Items: Tenable.ot/Qnap

Patch Publication Date: 6/10/2026

Vulnerability Publication Date: 6/10/2026

Reference Information

CVE: CVE-2025-66281

CWE: 476