Is CVE-2021-28809 actively exploited?

CVE-2021-28809 has no public evidence of in-the-wild exploitation as of 2024-11-21.

What is the CVSS score for CVE-2021-28809?

CVE-2021-28809 has a CVSS score of 9.8 (CRITICAL severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2021-28809?

Patch guidance is available from qnap security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-28809.

Fix CVE-2021-28809 - CRITICAL qnap hybrid backup sync

Q: Which products are affected by CVE-2021-28809?

3 products: qnap hybrid backup sync, qnap hybrid backup sync, qnap hybrid backup sync.

Description

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

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-284 CWE-306 · Missing Authentication CWE-749

Metadata

Primary Vendor: QNAP
Published: 7/8/2021
Last Modified: 11/21/2024
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2021-28809

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary