KEV Entry

CVE-2021-28799

Known Exploited Vulnerability Entry External Catalog

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Entry Details
Confirmed Exploited

CVE-2021-28799

2022-03-31 00:00 UTC

Timestamps

2022-03-31

2022-03-31

Scope

KEVIntel entry: Improper Authorization Vulnerability in HBS 3 (Hybrid Backup Sync) | Affected: QNAP Systems Inc. / HBS 3, HBS 2, HBS 1.3 | CVSS: 10.0 (CRITICAL) | Used in malware: yes | Not yet in CISA KEV: False

References
  • {'id': 'CVE-2021-28799', 'url': 'https://www.cve.org/CVERecord?id=CVE-2021-28799'}
  • {'id': 'kevintel', 'url': 'https://kevintel.com/vuln/CVE-2021-28799'}

b6bf6b23-c149-46f0-988a-2577c076c610

caeb2787-0d58-4236-9039-7c86c3e566f3

2026-06-23 11:13 UTC

2026-06-23 11:13 UTC

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
public_report kevintel confirmed_compromise 0.70
View details 
{
  "added_date": "2022-03-31T00:00:00.000Z",
  "ahead_of_cisa_kev": null,
  "cvss_score": 10.0,
  "cvss_severity": "CRITICAL",
  "epss_percentile": null,
  "epss_score": null,
  "feed": "KEVIntel (kevintel.com)",
  "not_yet_in_cisa_kev": false,
  "product": "HBS 3, HBS 2, HBS 1.3",
  "title": "Improper Authorization Vulnerability in HBS 3 (Hybrid Backup Sync)",
  "used_in_malware": "yes",
  "vendor": "QNAP Systems Inc."
}
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