What is CVE-2021-28809?

CVE-2021-28809 is a vulnerability that allows remote attackers to execute arbitrary code on affected installations of QNAP NAS.

How severe is CVE-2021-28809?

CVE-2021-28809 has a severity score of 9.8, which is classified as critical.

What is the affected software for CVE-2021-28809?

The affected software for CVE-2021-28809 includes QNAP NAS with Hybrid Backup Sync up to version 3.0.210507.

Is QNAP QTS vulnerable to CVE-2021-28809?

No, QNAP QTS versions 4.3.6, 4.3.4, and 4.3.3 are not vulnerable to CVE-2021-28809.

How can I fix CVE-2021-28809?

To fix CVE-2021-28809, users should update their QNAP NAS Hybrid Backup Sync to version 3.0.210507 or later.

Vulnerability/
CVE-2021-28809

critical

CWE

284 306 749

8/7/2021

7/8/2024

17/9/2024

CVE-2021-28809: QNAP NAS Hybrid Backup Missing Authentication for Critical Function Remote Code Execution Vulnerability

First published: Thu Jul 08 2021(Updated: )

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

Credit: security@qnapsecurity.com.tw

Affected Software	Affected Version	How to fix
QNAP NAS	<3.0.210507
QNAP QTS	=4.3.6
QNAP NAS	<3.0.210506
QNAP QTS	=4.3.4
QNAP QTS	=4.3.3
QNAP NAS

Remedy

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

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Reference Links

Frequently Asked Questions

What is CVE-2021-28809?
CVE-2021-28809 is a vulnerability that allows remote attackers to execute arbitrary code on affected installations of QNAP NAS.
How severe is CVE-2021-28809?
CVE-2021-28809 has a severity score of 9.8, which is classified as critical.
What is the affected software for CVE-2021-28809?
The affected software for CVE-2021-28809 includes QNAP NAS with Hybrid Backup Sync up to version 3.0.210507.
Is QNAP QTS vulnerable to CVE-2021-28809?
No, QNAP QTS versions 4.3.6, 4.3.4, and 4.3.3 are not vulnerable to CVE-2021-28809.
How can I fix CVE-2021-28809?
To fix CVE-2021-28809, users should update their QNAP NAS Hybrid Backup Sync to version 3.0.210507 or later.

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