CVE-2021-28799
QNAP NAS Improper Authorization Vulnerability
QNAP · Network Attached Storage (NAS)
Vulnerability details
QNAP NAS running HBS 3 contains an improper authorization vulnerability which can allow remote attackers to log in to a device.
Added to CISA KEV: 2022-03-31
Ransomware campaign use: Known
CISA due date: 2022-04-21
Defensive guidance from CISA
Apply updates per vendor instructions.
This is the source's required-action field, not an independently validated patch procedure. Refer to the vendor for exact affected versions and fixes.
Source catalog date: 2026-11-06T19:44:45.1797Z · Last retrieved: 2026-11-06 21:02:26 UTC