VULNERABILITY INTELLIGENCE

CVE-2021-28799

CVSS score10 CRITICAL
EPSS probability78.25%
CISA KEVKnown exploited vulnerability
Published2021-05-13
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Known Exploited Vulnerability

QNAP NAS Improper Authorization Vulnerability

Vendor / product: QNAP / Network Attached Storage (NAS)

Description

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 .

Weakness classification

  • security@qnapsecurity.com.tw: CWE-285
  • nvd@nist.gov: NVD-CWE-Other

Primary references