CVE-2024-21900Network attack vector

Authenticated command execution via undisclosed injection

Published Mar 8, 2024 · Updated Dec 16, 2025

Injection in QNAP QTS 5.1.x, QuTS hero h5.1.x, and QuTScloud c5.x allows remote authenticated users to execute arbitrary commands. QNAP has not disclosed the affected component, input, or improper operation beyond classifying the flaw as CWE-74 injection. Low-privileged access to a network interface is required, and successful exploitation changes system data through command execution.

CVSS severity4.3
Medium
EPSS probability9.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Injection in QNAP QTS 5.1.x, QuTS hero h5.1.x, and QuTScloud c5.x allows remote authenticated users to execute arbitrary commands. QNAP has not disclosed the affected component, input, or improper operation beyond classifying the flaw as CWE-74 injection. Low-privileged access to a network interface is required, and successful exploitation changes system data through command execution.

The record

CVE
CVE-2024-21900
Published
Mar 8, 2024
Updated
Dec 16, 2025
Vendor
Linn Products Limited
Product
QuTS hero
Classifications
CWE-74, CAPEC-64, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 8, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 16, 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=h5.1.x <h5.1.3.2578 build 20231110

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Linn Products Limited · QuTS heroversion=h5.1.x <h5.1.3.2578 build 20231110
Linn Products Limited · QuTScloudversion=c5.x.x <c5.1.5.2651
Linn Products Limited · QTSversion=5.1.x <5.1.3.2578 build 20231110

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
4.3QNAP Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

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-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CAPEC-64Using Slashes and URL Encoding Combined to Bypass Validation Logic
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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