CVE-2021-28799 - Vulnerability Details - OpenCVE

An improper authorization vulnerability has been reported to affect QNAP NAS running HBS 3 (Hybrid Backup Sync. ) If exploited, the vulnerability allows remote attackers to log in to a device. This issue affects: QNAP Systems Inc. HBS 3 versions prior to v16.0.0415 on QTS 4.5.2; versions prior to v3.0.210412 on QTS 4.3.6; versions prior to v3.0.210411 on QTS 4.3.4; versions prior to v3.0.210411 on QTS 4.3.3; versions prior to v16.0.0419 on QuTS hero h4.5.1; versions prior to v16.0.0419 on QuTScloud c4.5.1~c4.5.4. This issue does not affect: QNAP Systems Inc. HBS 2 . QNAP Systems Inc. HBS 1.3 .

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

This CVE is in the KEV database since March 31, 2022.

The EPSS score is 0.86248.

Exploitation active

Automatable yes

Technical Impact total

Vendors	Products
Qnap Subscribe	Hybrid Backup Sync Subscribe Qts Subscribe Quts Hero Subscribe Qutscloud Subscribe

Configuration 1 [-]

AND

cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:4.5.2:*:*:*:*:*:*:*

Configuration 2 [-]

AND

cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:4.3.6:*:*:*:*:*:*:*

Configuration 3 [-]

AND

cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:*

OR	cpe:2.3:o:qnap:qts:4.3.3:::::::*
	cpe:2.3:o:qnap:qts:4.3.4:::::::*

Configuration 4 [-]

AND

cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:*

cpe:2.3:o:qnap:quts_hero:h4.5.1:*:*:*:*:*:*:*

Configuration 5 [-]

AND

cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:*

cpe:2.3:o:qnap:qutscloud:*:*:*:*:*:*:*:*

No data.

No data.

Advisories

No advisories yet.

Fixes

Solution

QNAP have already fixed this vulnerability in the following versions of HBS 3: QTS 4.5.2: HBS 3 v16.0.0415 and later QTS 4.3.6: HBS 3 v3.0.210412 and later QTS 4.3.3 and 4.3.4: HBS 3 v3.0.210411 and later QuTS hero h4.5.1: HBS 3 v16.0.0419 and later QuTScloud c4.5.1~c4.5.4: HBS 3 v16.0.0419 and later

Workaround

No workaround given by the vendor.

References

Link	Providers
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-28799
https://www.qnap.com/en/security-advisory/QSA-21-13

History

Mon, 03 Nov 2025 15:15:00 +0000

Type	Values Removed	Values Added
CPEs	cpe:2.3:a:qnap:qts:4.3.3:::::::* cpe:2.3:a:qnap:qts:4.3.4:::::::* cpe:2.3:a:qnap:qts:4.5.2:::::::*	cpe:2.3:o:qnap:qts:4.3.3:::::::* cpe:2.3:o:qnap:qts:4.3.4:::::::* cpe:2.3:o:qnap:qts:4.5.2:::::::*

Wed, 22 Oct 2025 00:15:00 +0000

Type	Values Removed	Values Added
References		https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-28799

Tue, 21 Oct 2025 20:30:00 +0000

Type	Values Removed	Values Added
References	https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-28799

Tue, 21 Oct 2025 19:30:00 +0000

Type	Values Removed	Values Added
References		https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-28799

Tue, 04 Feb 2025 15:15:00 +0000

Type	Values Removed	Values Added
Metrics		kev `{'dateAdded': '2022-03-31'}` ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Projects

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MITRE

Status: PUBLISHED

Assigner: qnap

Published: 2021-05-13T02:55:13.827Z

Updated: 2025-10-21T23:25:45.551Z

Reserved: 2021-03-18T00:00:00.000Z

Link: CVE-2021-28799

Vulnrichment

Updated: 2024-08-03T21:55:11.685Z

NVD

Status : Analyzed

Published: 2021-05-13T03:15:06.843

Modified: 2025-11-03T15:07:48.747

Link: CVE-2021-28799

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

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This issue affects: QNAP Systems Inc. HBS 3 versions prior to v16.0.0415 on QTS 4.5.2; versions prior to v3.0.210412 on QTS 4.3.6; versions prior to v3.0.210411 on QTS 4.3.4; versions prior to v3.0.210411 on QTS 4.3.3; versions prior to v16.0.0419 on QuTS hero h4.5.1; versions prior to v16.0.0419 on QuTScloud c4.5.1~c4.5.4. This issue does not affect: QNAP Systems Inc. HBS 2 . QNAP Systems Inc. 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This issue affects: QNAP Systems Inc. HBS 3 versions prior to v16.0.0415 on QTS 4.5.2; versions prior to v3.0.210412 on QTS 4.3.6; versions prior to v3.0.210411 on QTS 4.3.4; versions prior to v3.0.210411 on QTS 4.3.3; versions prior to v16.0.0419 on QuTS hero h4.5.1; versions prior to v16.0.0419 on QuTScloud c4.5.1~c4.5.4. This issue does not affect: QNAP Systems Inc. HBS 2 . QNAP Systems Inc. HBS 1.3 ."}, {"lang": "es", "value": "Se ha reportado una vulnerabilidad de autorizaci\u00f3n inapropiada que afecta al QNAP NAS que ejecuta HBS versi\u00f3n 3 (Hybrid Backup Sync). Si es explotada, la vulnerabilidad permite a atacantes remotos iniciar sesi\u00f3n en un dispositivo. Este problema afecta a: QNAP Systems Inc. HBS 3 versiones anteriores a v16.0.0415 en QTS versi\u00f3n 4.5.2; versiones anteriores a v3.0.210412 en QTS versi\u00f3n 4.3.6; versiones anteriores a v3.0.210411 en QTS versi\u00f3n 4.3.4; versiones anteriores a v3.0.210411 en QTS versi\u00f3n 4.3.3; versiones anteriores a 16.0.0419 en QuTS hero versiones h4.5.1; anterior a versi\u00f3n v16.0.0419 en QuTScloud versiones c4.5.1~c4.5.4. Este problema no afecta a: QNAP Systems Inc. HBS versi\u00f3n 2. QNAP Systems Inc. HBS versi\u00f3n 1.3"}], "id": "CVE-2021-28799", "lastModified": "2025-11-03T15:07:48.747", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 7.5, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 10.0, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 6.0, "source": "security@qnapsecurity.com.tw", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-05-13T03:15:06.843", "references": [{"source": "security@qnapsecurity.com.tw", "tags": ["Vendor Advisory"], "url": "https://www.qnap.com/en/security-advisory/QSA-21-13"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://www.qnap.com/en/security-advisory/QSA-21-13"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["US Government Resource"], "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-28799"}], "sourceIdentifier": "security@qnapsecurity.com.tw", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-285"}], "source": "security@qnapsecurity.com.tw", "type": "Secondary"}, {"description": [{"lang": "en", "value": "NVD-CWE-Other"}], "source": "nvd@nist.gov", "type": "Primary"}]}