CVE-2021-28799
QNAP NAS Improper Authorization Vulnerability
IN CISA KEV
QNAP NAS running HBS 3 contains an improper authorization vulnerability which can allow remote attackers to log in to a device.
- Vendor
- QNAP
- Product
- Network Attached Storage (NAS)
- CVSS
- No score recorded (no NVD record loaded for this entry)
- CWE
- CWE-285
- Published
- Not recorded
- NVD modified
- Not recorded
CISA KEV
- Date added
- 2022-03-31
- Due date
- 2022-04-21
- Ransomware use
- Known
- Required action
- Apply updates per vendor instructions.
EPSS
78.3% chance of exploitation in the next 30 days (percentile 99th)
FIRST EPSS, updated 17 Oct 2026. About EPSS
CVSS is severity, EPSS is likelihood, KEV means already exploited. EPSS is a statistical probability, not a certainty: a low score does not make a bug safe, and a high one does not prove it is being exploited.
Data last updated 18 Oct 2026. Sources: NVD API 2.0, CISA KEV catalog, FIRST EPSS. Links: NVD, CISA KEV. Metadata only. ThreatWire does not host exploit code.