HB
Product
Hybrid Backup Sync
by Qnap · last CVE Jan 2, 2026
On CISA KEVExploited in the wildRansomware-linked
6
CVEs
1
On KEV
9.8
Max CVSS
0
New 30D
Severity mix
Critical 4High 1Medium 0Low 1
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CVECVSSEPSSPublishedSummary · affected versions
CVE-2021-28799
RansomwareIn wildKEV
9.8
78%
May 13
Improper Authorization Vulnerability in HBS 3 (Hybrid Backup Sync)
Affected: before 16.0.0415; before 3.0.210412; before 3.0.210411; before 16.0.0419; before 16.0.0419
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