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Qnap QTS and QuTS hero NULL Pointer Dereference (CVE-2025-66274)

medium Tenable OT Security Plugin ID 505140

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. If a remote attacker gains an administrator account, they can then exploit the vulnerability to launch a denial-of-service (DoS) attack. We have already fixed the vulnerability in the following version: QuTS hero h5.3.2.3354 build 20251225 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-26-08

Plugin Details

Severity: Medium

ID: 505140

File Name: tenable_ot_qnap_CVE-2025-66274.nasl

Version: 1.2

Type: remote

Family: Tenable.ot

Published: 2/12/2026

Updated: 2/13/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 6.1

CVSS v2

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 4.5

Vector: CVSS2#AV:N/AC:L/Au:M/C:N/I:N/A:C

CVSS Score Source: CVE-2025-66274

CVSS v3

Risk Factor: Medium

Base Score: 4.9

Temporal Score: 4.3

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 5.1

Threat Score: 1.2

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:qnap:quts_hero:-

Required KB Items: Tenable.ot/Qnap

Exploit Ease: No known exploits are available

Patch Publication Date: 2/11/2026

Vulnerability Publication Date: 2/11/2026

Reference Information

CVE: CVE-2025-66274

CWE: 476