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Vulnerability Details :

CVE-2025-66276

Summary
Assigner-qnap
Assigner Org ID-2fd009eb-170a-4625-932b-17a53af1051f
Published At-10 Jun, 2026 | 01:37
Updated At-10 Jun, 2026 | 16:07
Rejected At-
Credits

QTS

QuTS hero is not affected. We have already fixed the vulnerability in the following version: QTS 5.2.7.3256 build 20250913 and later

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–ĽCommon Vulnerabilities and Exposures (CVE)
cve.org
Assigner:qnap
Assigner Org ID:2fd009eb-170a-4625-932b-17a53af1051f
Published At:10 Jun, 2026 | 01:37
Updated At:10 Jun, 2026 | 16:07
Rejected At:
â–ĽCVE Numbering Authority (CNA)
QTS

QuTS hero is not affected. We have already fixed the vulnerability in the following version: QTS 5.2.7.3256 build 20250913 and later

Affected Products
Vendor
QNAP Systems, Inc.QNAP Systems Inc.
Product
QTS
Default Status
unaffected
Versions
Affected
  • From 5.2.0 before 5.2.7.3256 build 20250913 (custom)
Vendor
QNAP Systems, Inc.QNAP Systems Inc.
Product
QuTS hero
Default Status
unaffected
Versions
Unaffected
  • ?
Metrics
VersionBase scoreBase severityVector
4.09.2CRITICAL
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Version: 4.0
Base score: 9.2
Base severity: CRITICAL
Vector:
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

We have already fixed the vulnerability in the following version: QTS 5.2.7.3256 build 20250913 and later

Configurations

Workarounds

Exploits

Credits

finder
VĂ­ctor A. Morales
Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://www.qnap.com/en/security-advisory/qsa-25-56
N/A
Hyperlink: https://www.qnap.com/en/security-advisory/qsa-25-56
Resource: N/A
â–ĽAuthorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Problem Types
TypeCWE IDDescription
CWECWE-noinfoCWE-noinfo Not enough information
Type: CWE
CWE ID: CWE-noinfo
Description: CWE-noinfo Not enough information
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
â–ĽNational Vulnerability Database (NVD)
nvd.nist.gov
Source:security@qnapsecurity.com.tw
Published At:10 Jun, 2026 | 03:16
Updated At:12 Jun, 2026 | 20:25

QuTS hero is not affected. We have already fixed the vulnerability in the following version: QTS 5.2.7.3256 build 20250913 and later

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.09.2CRITICAL
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary3.19.8CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Type: Secondary
Version: 4.0
Base score: 9.2
Base severity: CRITICAL
Vector:
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Primary
Version: 3.1
Base score: 9.8
Base severity: CRITICAL
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CPE Matches

QNAP Systems, Inc.
qnap
>>qts>>Versions from 4.3.0(inclusive) to 5.2.7.3256(exclusive)
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
NVD-CWE-noinfoPrimarynvd@nist.gov
CWE ID: NVD-CWE-noinfo
Type: Primary
Source: nvd@nist.gov
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://www.qnap.com/en/security-advisory/qsa-25-56security@qnapsecurity.com.tw
Vendor Advisory
Hyperlink: https://www.qnap.com/en/security-advisory/qsa-25-56
Source: security@qnapsecurity.com.tw
Resource:
Vendor Advisory

Change History

0
Information is not available yet

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Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
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improper access control vulnerability in Helpdesk

The vulnerability have been reported to affect earlier versions of QTS. If exploited, this improper access control vulnerability could allow attackers to compromise the security of the software by gaining privileges, or reading sensitive information. This issue affects: QNAP Systems Inc. Helpdesk versions prior to 3.0.3.

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Action-Not Available
Vendor-QNAP Systems, Inc.
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Known To Be Used In Ransomware Campaigns?-Not Available
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Published-04 Dec, 2019 | 16:33
Updated-05 Aug, 2024 | 03:35
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

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Vendor-n/aQNAP Systems, Inc.
Product-music_stationqtsQNAP NAS devices
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Action-Not Available
Vendor-QNAP Systems, Inc.
Product-quts_heroqutscloudqtsQuTScloudQuTS heroQTSquts_heroqutscloudqts
CWE ID-CWE-287
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Matching Score-8
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Action-Not Available
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Matching Score-8
Assigner-QNAP Systems, Inc.
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Matching Score-8
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Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
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An improper authentication vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow users to compromise the security of the system via a network. We have already fixed the vulnerability in the following versions: QTS 5.1.3.2578 build 20231110 and later QuTS hero h5.1.3.2578 build 20231110 and later QuTScloud c5.1.5.2651 and later

Action-Not Available
Vendor-QNAP Systems, Inc.
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CWE ID-CWE-287
Improper Authentication
CVE-2021-44057
Matching Score-8
Assigner-QNAP Systems, Inc.
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Matching Score-8
Assigner-QNAP Systems, Inc.
CVSS Score-7.1||HIGH
EPSS-0.35% / 57.88%
||
7 Day CHG~0.00%
Published-05 May, 2022 | 16:50
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Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
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Action-Not Available
Vendor-QNAP Systems, Inc.
Product-photo_stationPhoto Station
CWE ID-CWE-287
Improper Authentication
CVE-2021-44055
Matching Score-8
Assigner-QNAP Systems, Inc.
ShareView Details
Matching Score-8
Assigner-QNAP Systems, Inc.
CVSS Score-5.3||MEDIUM
EPSS-0.80% / 74.40%
||
7 Day CHG~0.00%
Published-05 May, 2022 | 16:50
Updated-17 Sep, 2024 | 00:06
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Information leakage in Video Station

An missing authorization vulnerability has been reported to affect QNAP device running Video Station. If exploited, this vulnerability allows remote attackers to access data or perform actions that they should not be allowed to perform. We have already fixed this vulnerability in the following versions of Video Station: Video Station 5.5.9 ( 2022/02/16 ) and later

Action-Not Available
Vendor-QNAP Systems, Inc.
Product-video_stationVideo Station
CWE ID-CWE-862
Missing Authorization
CVE-2021-38679
Matching Score-8
Assigner-QNAP Systems, Inc.
ShareView Details
Matching Score-8
Assigner-QNAP Systems, Inc.
CVSS Score-6.5||MEDIUM
EPSS-0.20% / 41.85%
||
7 Day CHG~0.00%
Published-11 Feb, 2022 | 13:20
Updated-16 Sep, 2024 | 17:28
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Improper Authentication in Kazoo Server

An improper authentication vulnerability has been reported to affect QNAP NAS running Kazoo Server. If exploited, this vulnerability allows attackers to compromise the security of the system. We have already fixed this vulnerability in the following versions of Kazoo Server: Kazoo Server 4.11.22 and later

Action-Not Available
Vendor-QNAP Systems, Inc.
Product-kazoo_serverKazoo Server
CWE ID-CWE-287
Improper Authentication
CVE-2021-38690
Matching Score-8
Assigner-QNAP Systems, Inc.
ShareView Details
Matching Score-8
Assigner-QNAP Systems, Inc.
CVSS Score-8.1||HIGH
EPSS-1.21% / 79.41%
||
7 Day CHG~0.00%
Published-14 Jan, 2022 | 01:00
Updated-16 Sep, 2024 | 22:20
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Stack Overflow Vulnerability in QVR Elite, QVR Pro and QVR Guard

A stack buffer overflow vulnerability has been reported to affect QNAP device running QVR Elite, QVR Pro, QVR Guard. If exploited, this vulnerability allows attackers to execute arbitrary code. We have already fixed this vulnerability in the following versions of QVR Elite, QVR Pro, QVR Guard: QuTS hero h5.0.0: QVR Elite 2.1.4.0 (2021/12/06) and later QuTS hero h4.5.4: QVR Elite 2.1.4.0 (2021/12/06) and later QTS 5.0.0: QVR Elite 2.1.4.0 (2021/12/06) and later QTS 4.5.4: QVR Elite 2.1.4.0 (2021/12/06) and later QTS 4.5.4: QVR Pro 2.1.3.0 (2021/12/06) and later QTS 5.0.0: QVR Pro 2.1.3.0 (2021/12/06) and later QTS 4.5.4: QVR Guard 2.1.3.0 (2021/12/06) and later QTS 5.0.0: QVR Guard 2.1.3.0 (2021/12/06) and later

Action-Not Available
Vendor-QNAP Systems, Inc.
Product-qvr_guardqvr_eliteqvr_proQVR ProQVR EliteQVR Guard
CWE ID-CWE-120
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE ID-CWE-787
Out-of-bounds Write
CVE-2021-38685
Matching Score-8
Assigner-QNAP Systems, Inc.
ShareView Details
Matching Score-8
Assigner-QNAP Systems, Inc.
CVSS Score-9.8||CRITICAL
EPSS-1.13% / 78.77%
||
7 Day CHG~0.00%
Published-26 Nov, 2021 | 14:00
Updated-17 Sep, 2024 | 02:46
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Command Injection Vulnerability in VioStor

A command injection vulnerability has been reported to affect QNAP device, VioStor. If exploited, this vulnerability allows remote attackers to run arbitrary commands. We have already fixed this vulnerability in the following versions of QVR: QVR FW 5.1.6 build 20211109 and later

Action-Not Available
Vendor-QNAP Systems, Inc.
Product-qvrQVR
CWE ID-CWE-78
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CVE-2021-38689
Matching Score-8
Assigner-QNAP Systems, Inc.
ShareView Details
Matching Score-8
Assigner-QNAP Systems, Inc.
CVSS Score-8.1||HIGH
EPSS-1.21% / 79.41%
||
7 Day CHG~0.00%
Published-14 Jan, 2022 | 01:00
Updated-17 Sep, 2024 | 00:50
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Stack Overflow Vulnerability in QVR Elite, QVR Pro and QVR Guard

A stack buffer overflow vulnerability has been reported to affect QNAP device running QVR Elite, QVR Pro, QVR Guard. If exploited, this vulnerability allows attackers to execute arbitrary code. We have already fixed this vulnerability in the following versions of QVR Elite, QVR Pro, QVR Guard: QuTS hero h5.0.0: QVR Elite 2.1.4.0 (2021/12/06) and later QuTS hero h4.5.4: QVR Elite 2.1.4.0 (2021/12/06) and later QTS 5.0.0: QVR Elite 2.1.4.0 (2021/12/06) and later QTS 4.5.4: QVR Elite 2.1.4.0 (2021/12/06) and later QTS 4.5.4: QVR Pro 2.1.3.0 (2021/12/06) and later QTS 5.0.0: QVR Pro 2.1.3.0 (2021/12/06) and later QTS 4.5.4: QVR Guard 2.1.3.0 (2021/12/06) and later QTS 5.0.0: QVR Guard 2.1.3.0 (2021/12/06) and later

Action-Not Available
Vendor-QNAP Systems, Inc.
Product-qvr_guardqvr_eliteqvr_proQVR ProQVR EliteQVR Guard
CWE ID-CWE-120
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE ID-CWE-787
Out-of-bounds Write
CVE-2021-38687
Matching Score-8
Assigner-QNAP Systems, Inc.
ShareView Details
Matching Score-8
Assigner-QNAP Systems, Inc.
CVSS Score-8.1||HIGH
EPSS-0.81% / 74.71%
||
7 Day CHG~0.00%
Published-29 Dec, 2021 | 13:05
Updated-16 Sep, 2024 | 20:22
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Stack Overflow Vulnerability in Surveillance Station

A stack buffer overflow vulnerability has been reported to affect QNAP NAS running Surveillance Station. If exploited, this vulnerability allows attackers to execute arbitrary code. We have already fixed this vulnerability in the following versions of Surveillance Station: QTS 5.0.0 (64 bit): Surveillance Station 5.2.0.4.2 ( 2021/10/26 ) and later QTS 5.0.0 (32 bit): Surveillance Station 5.2.0.3.2 ( 2021/10/26 ) and later QTS 4.3.6 (64 bit): Surveillance Station 5.1.5.4.6 ( 2021/10/26 ) and later QTS 4.3.6 (32 bit): Surveillance Station 5.1.5.3.6 ( 2021/10/26 ) and later QTS 4.3.3: Surveillance Station 5.1.5.3.6 ( 2021/10/26 ) and later

Action-Not Available
Vendor-QNAP Systems, Inc.
Product-surveillance_stationqtsSurveillance Station
CWE ID-CWE-120
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CVE-2021-38684
Matching Score-8
Assigner-QNAP Systems, Inc.
ShareView Details
Matching Score-8
Assigner-QNAP Systems, Inc.
CVSS Score-8.1||HIGH
EPSS-0.81% / 74.71%
||
7 Day CHG~0.00%
Published-13 Nov, 2021 | 00:50
Updated-17 Sep, 2024 | 02:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Buffer Overflow Vulnerability in Multimedia Console

A stack buffer overflow vulnerability has been reported to affect QNAP NAS running Multimedia Console. If exploited, this vulnerability allows attackers to execute arbitrary code. We have already fixed this vulnerability in the following versions of Multimedia Console: Multimedia Console 1.4.3 ( 2021/10/05 ) and later Multimedia Console 1.5.3 ( 2021/10/05 ) and later

Action-Not Available
Vendor-QNAP Systems, Inc.
Product-multimedia_consoleMultimedia Console
CWE ID-CWE-787
Out-of-bounds Write
CVE-2021-38691
Matching Score-8
Assigner-QNAP Systems, Inc.
ShareView Details
Matching Score-8
Assigner-QNAP Systems, Inc.
CVSS Score-8.1||HIGH
EPSS-1.21% / 79.41%
||
7 Day CHG~0.00%
Published-14 Jan, 2022 | 01:00
Updated-17 Sep, 2024 | 04:03
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Stack Overflow Vulnerability in QVR Elite, QVR Pro and QVR Guard

A stack buffer overflow vulnerability has been reported to affect QNAP device running QVR Elite, QVR Pro, QVR Guard. If exploited, this vulnerability allows attackers to execute arbitrary code. We have already fixed this vulnerability in the following versions of QVR Elite, QVR Pro, QVR Guard: QuTS hero h5.0.0: QVR Elite 2.1.4.0 (2021/12/06) and later QuTS hero h4.5.4: QVR Elite 2.1.4.0 (2021/12/06) and later QTS 5.0.0: QVR Elite 2.1.4.0 (2021/12/06) and later QTS 4.5.4: QVR Elite 2.1.4.0 (2021/12/06) and later QTS 4.5.4: QVR Pro 2.1.3.0 (2021/12/06) and later QTS 5.0.0: QVR Pro 2.1.3.0 (2021/12/06) and later QTS 4.5.4: QVR Guard 2.1.3.0 (2021/12/06) and later QTS 5.0.0: QVR Guard 2.1.3.0 (2021/12/06) and later

Action-Not Available
Vendor-QNAP Systems, Inc.
Product-qvr_guardqvr_eliteqvr_proQVR ProQVR EliteQVR Guard
CWE ID-CWE-120
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE ID-CWE-787
Out-of-bounds Write
CVE-2020-2507
Matching Score-8
Assigner-QNAP Systems, Inc.
ShareView Details
Matching Score-8
Assigner-QNAP Systems, Inc.
CVSS Score-9.8||CRITICAL
EPSS-4.62% / 89.51%
||
7 Day CHG~0.00%
Published-03 Feb, 2021 | 15:51
Updated-16 Sep, 2024 | 19:40
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
command injection vulnerability in Helpdesk

The vulnerability have been reported to affect earlier versions of QTS. If exploited, this command injection vulnerability could allow remote attackers to run arbitrary commands. This issue affects: QNAP Systems Inc. Helpdesk versions prior to 3.0.3.

Action-Not Available
Vendor-QNAP Systems, Inc.
Product-helpdeskHelpdesk
CWE ID-CWE-77
Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE ID-CWE-78
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CVE-2020-2509
Matching Score-8
Assigner-QNAP Systems, Inc.
ShareView Details
Matching Score-8
Assigner-QNAP Systems, Inc.
CVSS Score-9.8||CRITICAL
EPSS-83.96% / 99.32%
||
7 Day CHG~0.00%
Published-17 Apr, 2021 | 03:50
Updated-27 Oct, 2025 | 17:01
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Known KEV||Action Due Date - 2022-05-02||Apply updates per vendor instructions.
Command Injection Vulnerability in QTS and QuTS hero

A command injection vulnerability has been reported to affect QTS and QuTS hero. If exploited, this vulnerability allows attackers to execute arbitrary commands in a compromised application. We have already fixed this vulnerability in the following versions: QTS 4.5.2.1566 Build 20210202 and later QTS 4.5.1.1495 Build 20201123 and later QTS 4.3.6.1620 Build 20210322 and later QTS 4.3.4.1632 Build 20210324 and later QTS 4.3.3.1624 Build 20210416 and later QTS 4.2.6 Build 20210327 and later QuTS hero h4.5.1.1491 build 20201119 and later

Action-Not Available
Vendor-QNAP Systems, Inc.
Product-qtsquts_heroQuTS heroQTSQNAP Network-Attached Storage (NAS)
CWE ID-CWE-77
Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE ID-CWE-78
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
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