CVE-2020-2509Known exploitationNetwork attack vector

Unauthenticated arbitrary command execution

Published Apr 17, 2021 · Updated Oct 21, 2025

OS command injection in QNAP QTS and QuTS hero allows remote attackers to execute arbitrary commands through a network request. QNAP has not published the affected component, request parameter, or operation that fails to neutralize command syntax. No authentication or user interaction is required, and successful exploitation grants command execution on the NAS.

CVSS severity9.8
Critical
EPSS probability33.38%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in QNAP QTS and QuTS hero allows remote attackers to execute arbitrary commands through a network request. QNAP has not published the affected component, request parameter, or operation that fails to neutralize command syntax. No authentication or user interaction is required, and successful exploitation grants command execution on the NAS.

The record

CVE
CVE-2020-2509
Published
Apr 17, 2021
Updated
Oct 21, 2025
Vendor
Linn Products Limited
Product
QuTS hero
Classifications
CWE-78, CWE-77, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 17, 2021CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <h4.5.1.1491 build 20201119

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Linn Products Limited · QuTS heroversion=unspecified <h4.5.1.1491 build 20201119
Linn Products Limited · QTSversion=unspecified <4.2.6 Build 20210327; version=unspecified <4.3.3.1624 Build 20210416; version=unspecified <4.3.4.1632 Build 20210324; version=unspecified <4.3.6.1620 Build 20210322; version=unspecified <4.5.1.1495 Build 20201123; version=unspecified <4.5.2.1566 Build 20210202

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NISTAV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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