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Vulnerabilities

Vulnerability · CVE-2020-2509

QNAP Network-Attached Storage (NAS) Command Injection Vulnerability

Published Apr 16, 2021 · catalog updated Jun 16, 2026 · QNAP QNAP Network-Attached Storage (NAS)

Patch now

CVE-2020-2509 is in the CISA known-exploited catalog, due May 2, 2022. Confirm QNAP QNAP Network-Attached Storage (NAS) against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Critical9.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
33.99%
Remediation
Remediation guidance
Affected products
cpe qnap/qts · vendor QNAP QNAP Network-Attached Storage (NAS)

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe qnap/qts4.2.6
  • vendor QNAP QNAP Network-Attached Storage (NAS)version unspecified

How to fix CVE-2020-2509

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2020-2509 is in the CISA known-exploited catalog, due May 2, 2022. Confirm QNAP QNAP Network-Attached Storage (NAS) against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with 4.2.6. Apply updates per vendor instructions.

What should an analyst verify?

CWE-77: Command Injection; CWE-78: OS Command Injection. EPSS 33.99%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 16, 2021 · Catalog

    Detected

    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

  2. Apr 11, 2022 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. May 2, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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

Sources

  • CISA KEVConfirmed exploitationCVE-2020-2509

    QNAP NAS devices contain a command injection vulnerability which could allow attackers to perform remote code execution.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2020-2509

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2020-2509

    30-day exploitation probability 34.0%

    first.org
  • NIST NVDVulnerability recordCVE-2020-2509

    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

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2020-2509

    QNAP NAS devices contain a command injection vulnerability which could allow attackers to perform remote code execution.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.