QNAP QTS/QuTS hero User Account buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k0.00

Summaryinfo

A vulnerability labeled as critical has been found in QNAP QTS and QuTS hero. This vulnerability affects unknown code of the component User Account Handler. Executing a manipulation can lead to buffer overflow. This vulnerability is registered as CVE-2025-30265. It is possible to launch the attack remotely. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical was found in QNAP QTS and QuTS hero (the affected version unknown). This vulnerability affects an unknown part of the component User Account Handler. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A buffer overflow vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains a user account, they can then exploit the vulnerability to modify memory or crash processes. We have already fixed the vulnerability in the following versions: QTS 5.2.5.3145 build 20250526 and later QuTS hero h5.2.5.3138 build 20250519 and later

The weakness was published by Searat and Izut as qsa-25-21. The advisory is shared for download at qnap.com. This vulnerability was named CVE-2025-30265 since 03/20/2025. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2025-1936). Once again VulDB remains the best source for vulnerability data.

Affected

  • QNAP NAS

Productinfo

Type

Vendor

Name

License

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: 6.4
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
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

03/20/2025 CVE reserved
08/29/2025 +161 days Advisory disclosed
08/29/2025 +0 days VulDB entry created
09/23/2025 +25 days VulDB entry last update

Sourcesinfo

Vendor: qnap.com

Advisory: qsa-25-21
Researcher: Searat, Izut
Status: Confirmed

CVE: CVE-2025-30265 (🔒)
GCVE (CVE): GCVE-0-2025-30265
GCVE (VulDB): GCVE-100-321940
CERT Bund: WID-SEC-2025-1936 - QNAP NAS QTS und QTS hero: Mehrere Schwachstellen

Entryinfo

Created: 08/29/2025 23:22
Updated: 09/23/2025 05:10
Changes: 08/29/2025 23:22 (68), 09/01/2025 11:00 (7), 09/23/2025 05:10 (11)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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