Auth bypass in Qnap Hybrid_backup_sync
CVE-2021-28809
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 vulner…
EPSS: 0.158 (96.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Qnap Hybrid_backup_sync
- Qnap Qts — versions 4.3.6, 4.3.4, 4.3.3
- Qnap Systems Inc. Hbs 3 — versions unspecified
Weakness classification (CWE)
References
- security@qnapsecurity.com.tw (x_refsource_MISC, Vendor Advisory)
- security@qnapsecurity.com.tw (VDB Entry, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-28809?
- CVE-2021-28809 is a critical-severity vulnerability in Qnap Hybrid_backup_sync, classified under Improper Access Control. CVSS score: 9.8/10. Published 2021-07-08.
- How severe is CVE-2021-28809?
- Critical severity. CVSS v3 base score is 9.8 out of 10.