CVE-2021-44051Network attack vector

Authenticated arbitrary command execution

Published May 5, 2022 · Updated Sep 16, 2024

Command injection in QNAP QTS, QuTS hero, and QuTScloud allows remote authenticated users to execute arbitrary commands. QNAP has not disclosed the affected component, input parameter, or operation that passes untrusted data to a command interpreter. Network access and low-privilege credentials are required; successful exploitation permits command execution with the vulnerable service's privileges.

CVSS severity8.8
High
EPSS probability1.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in QNAP QTS, QuTS hero, and QuTScloud allows remote authenticated users to execute arbitrary commands. QNAP has not disclosed the affected component, input parameter, or operation that passes untrusted data to a command interpreter. Network access and low-privilege credentials are required; successful exploitation permits command execution with the vulnerable service's privileges.

The record

CVE
CVE-2021-44051
Published
May 5, 2022
Updated
Sep 16, 2024
Vendor
Linn Products Limited
Product
QuTS hero
Classifications
CWE-77, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 5, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record 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 <h5.0.0.1986 build 20220324

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Linn Products Limited · QuTS heroversion=unspecified <h5.0.0.1986 build 20220324
Linn Products Limited · QuTScloudversion=unspecified <c5.0.1.1949
Linn Products Limited · QTSversion=unspecified <5.0.0.1986 build 20220324

Published CVSS scores

8.8QNAP Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5NIST NVDAV:N/AC:L/Au:S/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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.

Technologies

Your stack

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Your stack

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