CVSS 3.1
9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HCVE-2021-28809
Critical (9.8) in qnap hybrid backup sync. EPSS 16% chance of exploitation in the next 30 days.
An improper access control vulnerability has been reported to affect certain legacy versions of HBS 3. If exploited, this vulnerability allows attackers to compromise the security of the operating system.QNAP have already fixed this vulnerability in the following versions of HBS 3: QTS 4.3.6: HBS 3 v3.0.210507 and later QTS 4.3.4: HBS 3 v3.0.210506 and later QTS 4.3.3: HBS 3 v3.0.210506 and later
Severity
- EPSS
- 16% chance of exploitation in the next 30 days; higher than 96% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-284, CWE-306, CWE-749
- Published
- Modified
- Record from
- the NVD, synced
Affected
- qnap:hybrid_backup_sync