{"affected": [{"affectedData": [{"platforms": ["QTS 4.5.2"], "product": "HBS 3", "vendor": "QNAP Systems Inc.", "versions": [{"lessThan": "v16.0.0415", "status": "affected", "version": "unspecified", "versionType": "custom"}]}, {"platforms": ["QTS 4.3.6"], "product": "HBS 3", "vendor": "QNAP Systems Inc.", "versions": [{"lessThan": "v3.0.210412", "status": "affected", "version": "unspecified", "versionType": "custom"}]}, {"platforms": ["QTS 4.3.4"], "product": "HBS 3", "vendor": "QNAP Systems Inc.", "versions": [{"lessThan": "v3.0.210411", "status": "affected", "version": "unspecified", "versionType": "custom"}]}, {"platforms": ["QTS 4.3.3"], "product": "HBS 3", "vendor": "QNAP Systems Inc.", "versions": [{"lessThan": "v3.0.210411", "status": "affected", "version": "unspecified", "versionType": "custom"}]}, {"platforms": ["QuTS hero h4.5.1"], "product": "HBS 3", "vendor": "QNAP Systems Inc.", "versions": [{"lessThan": "v16.0.0419", "status": "affected", "version": "unspecified", "versionType": "custom"}]}, {"platforms": ["QuTScloud c4.5.1~c4.5.4"], "product": "HBS 3", "vendor": "QNAP Systems Inc.", "versions": [{"lessThan": "v16.0.0419", "status": "affected", "version": "unspecified", "versionType": "custom"}]}, {"product": "HBS 2", "vendor": "QNAP Systems Inc.", "versions": [{"status": "unaffected", "version": "all versions"}]}, {"product": "HBS 1.3", "vendor": "QNAP Systems Inc.", "versions": [{"status": "unaffected", "version": "all versions"}]}], "source": "security@qnapsecurity.com.tw"}], "cisaActionDue": "2022-04-21", "cisaExploitAdd": "2022-03-31", "cisaRequiredAction": "Apply updates per vendor instructions.", "cisaVulnerabilityName": "QNAP NAS Improper Authorization Vulnerability", "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:*", "matchCriteriaId": "A18656F9-AFB4-44BC-AF08-E1A0A5D2EF49", "versionEndExcluding": "16.0.0415", "vulnerable": true}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:o:qnap:qts:4.5.2:*:*:*:*:*:*:*", "matchCriteriaId": "1AC8BD83-EA71-4AF8-AAEC-E46EFCA99EA2", "vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:*", "matchCriteriaId": "D5920EA4-EEA5-4F64-B06B-EED06E824864", "versionEndExcluding": "3.0.210412", "vulnerable": true}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:o:qnap:qts:4.3.6:*:*:*:*:*:*:*", "matchCriteriaId": "FE9FAC96-AA2A-4CA5-A170-8C0E6BD47391", "vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:*", "matchCriteriaId": "78491B95-5835-411B-B188-30E496BCB10A", "versionEndExcluding": "3.0.210411", "vulnerable": true}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:o:qnap:qts:4.3.3:*:*:*:*:*:*:*", "matchCriteriaId": "C5994C07-17FE-4784-9FA4-9675BA8B4743", "vulnerable": false}, {"criteria": "cpe:2.3:o:qnap:qts:4.3.4:*:*:*:*:*:*:*", "matchCriteriaId": "F0C7D2D4-769F-4297-89F4-75366FFA7618", "vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:*", "matchCriteriaId": "BB2A5649-4BB9-46E9-8A1A-B6046125BD92", "versionEndExcluding": "16.0.0419", "vulnerable": true}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:o:qnap:quts_hero:h4.5.1:*:*:*:*:*:*:*", "matchCriteriaId": "548228B3-EB2C-42C1-895B-DA6DC5CA26EE", "vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:*", "matchCriteriaId": "BB2A5649-4BB9-46E9-8A1A-B6046125BD92", "versionEndExcluding": "16.0.0419", "vulnerable": true}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:o:qnap:qutscloud:*:*:*:*:*:*:*:*", "matchCriteriaId": "FEDF704D-D5AD-45C2-AD7D-E53189C72E1A", "versionEndIncluding": "c4.5.4", "versionStartIncluding": "c4.5.1", "vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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 ."}, {"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": "2026-06-17T03:46:53.003", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-28799", "options": [{"exploitation": "active"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-02-04T14:53:29.275519Z", "version": "2.0.3"}}]}, "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"}]}
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