Coverage › CVE-2021-28799
CVE-2021-28799 Unmapped
QNAP NAS Improper Authorization Vulnerability
- Vendor / product
- QNAP — Network Attached Storage (NAS)
- Description (CISA)
- QNAP NAS running HBS 3 contains an improper authorization vulnerability which can allow remote attackers to log in to a device.
- Added to KEV
- 2022-03-31
- Due date
- 2022-04-21
- Required action
- Apply updates per vendor instructions.
- Known ransomware use
- Known
- CWE
- CWE-285
- CISA notes
- https://nvd.nist.gov/vuln/detail/CVE-2021-28799
- Elsewhere
- cve.org · NVD · CISA KEV · JSON
ATT&CK techniques
No public source states how this vulnerability is exploited in ATT&CK terms.
The only authoritative CVE → ATT&CK mapping in the open — CTID's Mappings Explorer, pinned to a KEV snapshot of 2025-07-28 and ATT&CK 16.1 — does not include CVE-2021-28799. CISA's catalogue carries no technique field. kevmap does not infer techniques from the CWE (CWE-285) — here is why — and does not guess.
This page will change state automatically if a mapping is published. What is shown above is everything CISA publishes about the entry.