CVE-2021-28799

QNAP NAS Improper Authorization Vulnerability

Severity Score

9.8

*CVSS v3.1

Exploit Likelihood

88.8%

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

Yes

*KEV

Decision

Act

*SSVC

Descriptions

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 on QTS 4.3.3; versions prior to v16.0.0419 on QuTS hero h4.5.1; versions prior to v16.0.0419 on QuTScloud c4.5.1~c4.5.4. This issue does not affect: QNAP Systems Inc. HBS 2 . QNAP Systems Inc. HBS 1.3 .

Se ha reportado una vulnerabilidad de autorización inapropiada que afecta al QNAP NAS que ejecuta HBS versión 3 (Hybrid Backup Sync). Si es explotada, la vulnerabilidad permite a atacantes remotos iniciar sesión en un dispositivo. Este problema afecta a: QNAP Systems Inc. HBS 3 versiones anteriores a v16.0.0415 en QTS versión 4.5.2; versiones anteriores a v3.0.210412 en QTS versión 4.3.6; versiones anteriores a v3.0.210411 en QTS versión 4.3.4; versiones anteriores a v3.0.210411 en QTS versión 4.3.3; versiones anteriores a 16.0.0419 en QuTS hero versiones h4.5.1; anterior a versión v16.0.0419 en QuTScloud versiones c4.5.1~c4.5.4. Este problema no afecta a: QNAP Systems Inc. HBS versión 2. QNAP Systems Inc. HBS versión 1.3

QNAP NAS running HBS 3 contains an improper authorization vulnerability which can allow remote attackers to log in to a device.

*Credits: ZUSO ART

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:Act

Exploitation

Active

Automatable

Yes

Tech. Impact

Total

* Organization's Worst-case Scenario

Timeline

2021-03-18 CVE Reserved
2021-05-13 CVE Published
2022-03-31 Exploited in Wild
2022-04-21 KEV Due Date
2025-02-04 CVE Updated
2025-03-30 EPSS Updated
---------- First Exploit

CWE

CWE-285: Improper Authorization

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.qnap.com/en/security-advisory/QSA-21-13	2023-11-14

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Affected Vendors, Products, and Versions (6)

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Qnap Search vendor "Qnap"	Hybrid Backup Sync Search vendor "Qnap" for product "Hybrid Backup Sync"	< 16.0.0415 Search vendor "Qnap" for product "Hybrid Backup Sync" and version " < 16.0.0415"	-	Affected	in	Qnap Search vendor "Qnap"	Qts Search vendor "Qnap" for product "Qts"	4.5.2 Search vendor "Qnap" for product "Qts" and version "4.5.2"	-	Safe
Qnap Search vendor "Qnap"	Hybrid Backup Sync Search vendor "Qnap" for product "Hybrid Backup Sync"	< 3.0.210412 Search vendor "Qnap" for product "Hybrid Backup Sync" and version " < 3.0.210412"	-	Affected	in	Qnap Search vendor "Qnap"	Qts Search vendor "Qnap" for product "Qts"	4.3.6 Search vendor "Qnap" for product "Qts" and version "4.3.6"	-	Safe
Qnap Search vendor "Qnap"	Hybrid Backup Sync Search vendor "Qnap" for product "Hybrid Backup Sync"	< 3.0.210411 Search vendor "Qnap" for product "Hybrid Backup Sync" and version " < 3.0.210411"	-	Affected	in	Qnap Search vendor "Qnap"	Qts Search vendor "Qnap" for product "Qts"	4.3.3 Search vendor "Qnap" for product "Qts" and version "4.3.3"	-	Safe
Qnap Search vendor "Qnap"	Hybrid Backup Sync Search vendor "Qnap" for product "Hybrid Backup Sync"	< 3.0.210411 Search vendor "Qnap" for product "Hybrid Backup Sync" and version " < 3.0.210411"	-	Affected	in	Qnap Search vendor "Qnap"	Qts Search vendor "Qnap" for product "Qts"	4.3.4 Search vendor "Qnap" for product "Qts" and version "4.3.4"	-	Safe
Qnap Search vendor "Qnap"	Hybrid Backup Sync Search vendor "Qnap" for product "Hybrid Backup Sync"	< 16.0.0419 Search vendor "Qnap" for product "Hybrid Backup Sync" and version " < 16.0.0419"	-	Affected	in	Qnap Search vendor "Qnap"	Quts Hero Search vendor "Qnap" for product "Quts Hero"	h4.5.1 Search vendor "Qnap" for product "Quts Hero" and version "h4.5.1"	-	Safe
Qnap Search vendor "Qnap"	Hybrid Backup Sync Search vendor "Qnap" for product "Hybrid Backup Sync"	< 16.0.0419 Search vendor "Qnap" for product "Hybrid Backup Sync" and version " < 16.0.0419"	-	Affected	in	Qnap Search vendor "Qnap"	Qutscloud Search vendor "Qnap" for product "Qutscloud"	>= c4.5.1 <= c4.5.4 Search vendor "Qnap" for product "Qutscloud" and version " >= c4.5.1 <= c4.5.4"	-	Safe

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