AEGLIX vulnerability intelligence
CVE-2021-28799
CRITICAL · CVSS 10.0 · Analyzed
Published: 2021-05-13 · Updated: 2026-06-17 · Source: NVD
Vulnerability overview
An improper authorization vulnerability has been reported to affect QNAP NAS running HBS 3 (Hybrid Backup Sync. ) If exploited, the vulnerability allows remote attackers to log in to a device. This issue affects: QNAP Systems Inc. HBS 3 versions prior to v16.0.0415 on QTS 4.5.2; versions prior to v3.0.210412 on QTS 4.3.6; versions prior to v3.0.210411 on QTS 4.3.4; versions prior to v3.0.210411 on QTS 4.3.3; versions prior to v16.0.0419 on QuTS hero h4.5.1; versions prior to v16.0.0419 on QuTScloud c4.5.1~c4.5.4. This issue does not affect: QNAP Systems Inc. HBS 2 . QNAP Systems Inc. HBS 1.3 .
Severity and scoring
- CVSS score
- 10.0 · CRITICAL
- CVSS version
- 3.1
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Weaknesses
- CWE-285, NVD-CWE-Other
CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.
Known exploitation and remediation
Listed in CISA’s Known Exploited Vulnerabilities catalog.
- Affected product
- QNAP · Network Attached Storage (NAS)
- Added to catalog
- 2022-03-31
- Required action
- Apply updates per vendor instructions.
- CISA remediation due date
- 2022-04-21
CISA deadlines apply to the organizations covered by its directives. Confirm your own remediation requirements.
Verify affected versions and patch availability in the vendor advisory before making changes.
Affected products and versions
cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:*
Before (exclusive): 16.0.0415
cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:*
Before (exclusive): 3.0.210412
cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:*
Before (exclusive): 3.0.210411
cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:*
Before (exclusive): 16.0.0419
cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:*
Before (exclusive): 16.0.0419
These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.
Advisories and references
- https://www.qnap.com/en/security-advisory/QSA-21-13
Vendor Advisory
- https://www.qnap.com/en/security-advisory/QSA-21-13
Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-28799
US Government Resource