CVE-2021-28809

CRITICAL

HBS 3 - Improper Access Control

Title source: llm
STIX 2.1

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

Scores

CVSS v3 9.8
EPSS 0.0058
EPSS Percentile 68.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-284 CWE-306 CWE-749
Status published
Products (1)
qnap/hybrid_backup_sync < 3.0.210507
Published Jul 08, 2021
Tracked Since Feb 18, 2026