CVE-2021-28799 on CISA KEV

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;

01What CISA says about this vulnerability

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…

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

• www.qnap.com — https://www.qnap.com/en/security-advisory/QSA-21-13

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
QNAP Systems Inc.	HBS 3	unspecified
QNAP Systems Inc.	HBS 3	unspecified
QNAP Systems Inc.	HBS 3	unspecified
QNAP Systems Inc.	HBS 3	unspecified
QNAP Systems Inc.	HBS 3	unspecified
QNAP Systems Inc.	HBS 3	unspecified
QNAP Systems Inc.	HBS 2	all versions
QNAP Systems Inc.	HBS 1.3	all versions

06Detection

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection:

Open in Sigma generator →