Vulnerability Database

393,392

Total vulnerabilities in the database

CVE-2020-2509 — qnap / qts

Improper Neutralization of Special Elements used in a Command ('Command Injection')

A command injection vulnerability has been reported to affect QTS and QuTS hero. If exploited, this vulnerability allows attackers to execute arbitrary commands in a compromised application. We have already fixed this vulnerability in the following versions: QTS 4.5.2.1566 Build 20210202 and later QTS 4.5.1.1495 Build 20201123 and later QTS 4.3.6.1620 Build 20210322 and later QTS 4.3.4.1632 Build 20210324 and later QTS 4.3.3.1624 Build 20210416 and later QTS 4.2.6 Build 20210327 and later QuTS hero h4.5.1.1491 build 20201119 and later

  • Published: Apr 17, 2021
  • Updated: Oct 3, 2026
  • CVE: CVE-2020-2509
  • Severity: Critical
  • Exploit:
  • CISA KEV:

CVSS v3:

  • Severity: Critical
  • Score: 9.8
  • AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2:

  • Severity: High
  • Score: 7.5
  • AV:N/AC:L/Au:N/C:P/I:P/A:P
Software Affected versions
qnap / qts < 4.2.6
qnap / qts >= 4.4.0, < 4.5.1
qnap / qts >= 4.3.5, < 4.3.6
qnap / quts_hero < h4.5.1
qnap / qts = 4.2.6
qnap / qts = 4.2.6-build_20170517
qnap / qts = 4.2.6-build_20190322
qnap / qts = 4.2.6-build_20190730
qnap / qts = 4.2.6-build_20190921
qnap / qts = 4.2.6-build_20191107
qnap / qts = 4.2.6-build_20200109
qnap / qts = 4.2.6-build_20200421
qnap / qts = 4.2.6-build_20200611
qnap / qts = 4.2.6-build_20200821
qnap / qts = 4.3.3.0174
qnap / qts = 4.3.3.0868
qnap / qts = 4.3.3.0998
qnap / qts = 4.3.3.1051
qnap / qts = 4.3.3.1098
qnap / qts = 4.3.3.1161
qnap / qts = 4.3.3.1252
qnap / qts = 4.3.3.1315
qnap / qts = 4.3.3.1386
qnap / qts = 4.3.3.1432
qnap / qts = 4.3.4.0358
qnap / qts = 4.3.4.0358-beta1
qnap / qts = 4.3.4.0370
qnap / qts = 4.3.4.0370-beta1
qnap / qts = 4.3.4.0372
qnap / qts = 4.3.4.0372-beta1
qnap / qts = 4.3.4.0374
qnap / qts = 4.3.4.0374-beta1
qnap / qts = 4.3.4.0387
qnap / qts = 4.3.4.0387-beta2
qnap / qts = 4.3.4.0411
qnap / qts = 4.3.4.0416
qnap / qts = 4.3.4.0427
qnap / qts = 4.3.4.0434
qnap / qts = 4.3.4.0435
qnap / qts = 4.3.4.0451
qnap / qts = 4.3.4.0483
qnap / qts = 4.3.4.0486
qnap / qts = 4.3.4.0506
qnap / qts = 4.3.4.0516
qnap / qts = 4.3.4.0526
qnap / qts = 4.3.4.0551
qnap / qts = 4.3.4.0557
qnap / qts = 4.3.4.0561
qnap / qts = 4.3.4.0569
qnap / qts = 4.3.4.0593
qnap / qts = 4.3.4.0597
qnap / qts = 4.3.4.0604
qnap / qts = 4.3.4.0899
qnap / qts = 4.3.4.1029
qnap / qts = 4.3.4.1082
qnap / qts = 4.3.4.1190
qnap / qts = 4.3.4.1282
qnap / qts = 4.3.4.1368
qnap / qts = 4.3.4.1417
qnap / qts = 4.3.4.1463
qnap / qts = 4.3.6
qnap / qts = 4.3.6.0895
qnap / qts = 4.3.6.0907
qnap / qts = 4.3.6.0923
qnap / qts = 4.3.6.0944
qnap / qts = 4.3.6.0959
qnap / qts = 4.3.6.0979
qnap / qts = 4.3.6.0993
qnap / qts = 4.3.6.1013
qnap / qts = 4.3.6.1033
qnap / qts = 4.3.6.1070
qnap / qts = 4.3.6.1154
qnap / qts = 4.3.6.1218
qnap / qts = 4.3.6.1263
qnap / qts = 4.3.6.1286
qnap / qts = 4.3.6.1333
qnap / qts = 4.3.6.1411
qnap / qts = 4.3.6.1446
qnap / qts = 4.5.1
qnap / qts = 4.5.1.1456
qnap / qts = 4.5.1.1461
qnap / qts = 4.5.1.1465
qnap / qts = 4.5.1.1480
qnap / qts = 4.5.2
qnap / quts_hero = h4.5.1
qnap / quts_hero = h4.5.1.1472

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.