Vulnerability Monitor

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CVE-2021-44052

An improper link resolution before file access ('Link Following') vulnerability has been reported to affect QNAP device running QuTScloud, QuTS hero, and QTS. If exploited, this vulnerability allows remote attackers to traverse the file system to unintended locations and read or overwrite the contents of unexpected files. We have already fixed this vulnerability in the following versions of QuTScloud, QuTS hero, and QTS: QuTScloud c5.0.1.1998 and later QuTS hero h4.5.4.1971 build 20220310 and later QuTS hero h5.0.0.1986 build 20220324 and later QTS 4.3.4.1976 build 20220303 and later QTS 4.3.3.1945 build 20220303 and later QTS 4.2.6 build 20220304 and later QTS 4.3.6.1965 build 20220302 and later QTS 5.0.0.1986 build 20220324 and later QTS 4.5.4.1991 build 20220329 and later

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 6.5, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction requiring only low-level privileges . The vulnerability impacts confidentiality (data exposure), for affected systems. Impacting 3 products from qnap, from qnap, from qnap organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2022, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2022-05-05T17:15:10.220

Last Modified

2024-11-21T06:30:18.430

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 6.5 (MEDIUM)

CVSSv2 Vector

AV:N/AC:L/Au:S/C:P/I:P/A:N

  • Access Vector: NETWORK
  • Access Complexity: LOW
  • Authentication: SINGLE
  • Confidentiality Impact: PARTIAL
  • Integrity Impact: PARTIAL
  • Availability Impact: NONE
Exploitability Score

8.0

Impact Score

4.9

Weaknesses
  • Type: Secondary
    CWE-59
  • Type: Primary
    CWE-59
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application qnap qts < 5.0.0.1986 Yes
Operating System qnap qts < 4.3.3.1945 Yes
Operating System qnap qts < 4.3.4.1976 Yes
Operating System qnap qts < 4.3.6.1965 Yes
Operating System qnap qts < 4.5.4.1991 Yes
Operating System qnap qts 4.2.6 Yes
Operating System qnap qts 4.2.6 Yes
Operating System qnap qts 4.2.6 Yes
Operating System qnap qts 4.2.6 Yes
Operating System qnap qts 4.2.6 Yes
Operating System qnap qts 4.2.6 Yes
Operating System qnap qts 4.2.6 Yes
Operating System qnap qts 4.2.6 Yes
Operating System qnap qts 4.2.6 Yes
Operating System qnap qts 4.2.6 Yes
Operating System qnap qts 4.2.6 Yes
Operating System qnap quts_hero < h4.5.4.1771 Yes
Operating System qnap quts_hero < h5.0.0.1986 Yes
Operating System qnap qutscloud < c5.0.1.1998 Yes
References

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For qnap's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.