Vulnerability Details : 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 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
Vulnerability category: BypassGain privilege
Products affected by CVE-2021-28809
- cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:*
- cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-28809
0.79%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 82 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-28809
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
10.0
|
HIGH | AV:N/AC:L/Au:N/C:C/I:C/A:C |
10.0
|
10.0
|
NIST | |
9.8
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
NIST | |
9.8
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
QNAP Systems, Inc. |
CWE ids for CVE-2021-28809
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The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.Assigned by: security@qnapsecurity.com.tw (Primary)
-
The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.Assigned by: security@qnapsecurity.com.tw (Primary)
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The product provides an Applications Programming Interface (API) or similar interface for interaction with external actors, but the interface includes a dangerous method or function that is not properly restricted.Assigned by: security@qnapsecurity.com.tw (Primary)
References for CVE-2021-28809
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https://www.zerodayinitiative.com/advisories/ZDI-21-783/
ZDI-21-783 | Zero Day InitiativeThird Party Advisory;VDB Entry
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https://www.qnap.com/en/security-advisory/qsa-21-19
Improper Access Control Vulnerability in Legacy HBS 3 (Hybrid Backup Sync) - Security Advisory | QNAPVendor Advisory
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