QNAP QTS/QuTS hero 5.2.9.3410/5.3.4.3500/6.0.0.3397 null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k2.33

Summaryinfo

A vulnerability classified as problematic has been found in QNAP QTS and QuTS hero 5.2.9.3410/5.3.4.3500/6.0.0.3397. Affected is an unknown function. The manipulation leads to null pointer dereference. This vulnerability is documented as CVE-2025-66281. The attack can be initiated remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in QNAP QTS and QuTS hero 5.2.9.3410/5.3.4.3500/6.0.0.3397. It has been rated as problematic. This issue affects some unknown processing. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. The summary by CVE is:

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

The weakness was released by Bechir Bouali as qsa-26-10. The advisory is shared at qnap.com. The identification of this vulnerability is CVE-2025-66281 since 11/26/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-210102). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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Vendor

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Timelineinfo

11/26/2025 CVE reserved
06/10/2026 +195 days Advisory disclosed
06/10/2026 +0 days VulDB entry created
06/10/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: qnap.com

Advisory: qsa-26-10
Researcher: Bechir Bouali
Status: Confirmed

CVE: CVE-2025-66281 (🔒)
GCVE (CVE): GCVE-0-2025-66281
GCVE (VulDB): GCVE-100-370061
EUVD: 🔒

Entryinfo

Created: 06/10/2026 06:46
Updated: 06/10/2026 19:48
Changes: 06/10/2026 06:46 (68), 06/10/2026 19:48 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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