CVE-2021-28799

QNAP NAS running HBS 3 contains an improper authorization vulnerability which can allow remote attackers to log in to a device.

Browse: All 2021 CVEs · All vendors

CISA KEV: Yes — actively exploited (added 2022-03-31, remediation due 2022-04-21)
Ransomware: Known ransomware campaign use
Weakness (CWE): CWE-285

Description

QNAP NAS running HBS 3 contains an improper authorization vulnerability which can allow remote attackers to log in to a device.

Affected products

QNAP Network Attached Storage (NAS)

Affected ranges per NVD CPE data; confirm exact versions in the vendor advisory.

Required action (CISA)

Apply updates per vendor instructions. Federal remediation deadline: 2022-04-21.

How to prioritize this

This vulnerability is on the CISA KEV list, meaning it is being actively exploited — treat it as urgent regardless of the raw CVSS number. Use the live CVE lookup for the latest NVD data, and the CVSS 3.1 calculator to model your own environmental score.

FAQ

Is CVE-2021-28799 actively exploited?

Yes. CISA added CVE-2021-28799 to its Known Exploited Vulnerabilities (KEV) catalog on 2022-03-31, with a federal remediation deadline of 2022-04-21. A KEV listing means real-world exploitation is confirmed, so patching this should be prioritized above many higher-CVSS bugs that aren't being exploited.

What is the CVSS score of CVE-2021-28799?

CVE-2021-28799 has no published CVSS base score yet — NVD analysis can lag disclosure. Check the vendor references for an interim severity.

Related vulnerabilities

Data source: NVD & CISA KEV. Shown as-is; nothing added. Last generated from NVD data — re-check the live tool for updates.