March 31, 2022 · Applied Cybernetics Group
CVE-2021-28799 — QNAP Network Attached Storage (NAS)
known ransomware use
QNAP NAS Improper Authorization Vulnerability
- Added to KEV
2022-03-31- Federal due date
2022-04-21- Vendor
- QNAP
- Product
- Network Attached Storage (NAS)
- EPSS
- 99.6th percentile (score 0.782, as of
2026-09-16) - NVD CVSS v3.1
- —
- Ransomware use
- Known
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2021-28799
CISA short description
QNAP NAS running HBS 3 contains an improper authorization vulnerability which can allow remote attackers to log in to a device.
Required action
Apply updates per vendor instructions.