CVE-2024-21905Network attack vector

System compromise via undisclosed integer overflow

Published Apr 26, 2024 · Updated Aug 12, 2024

Integer overflow in QNAP QTS 5.1.x, QuTS hero h5.1.x, and QuTScloud c5.x allows remote attackers to alter or interrupt systems. QNAP has not disclosed the affected component, input field, or arithmetic operation that permits the integer value to overflow or wrap. No prior privileges or user interaction are required; QNAP has not bounded the resulting system alteration or interruption.

CVSS severity6.5
Medium
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in QNAP QTS 5.1.x, QuTS hero h5.1.x, and QuTScloud c5.x allows remote attackers to alter or interrupt systems. QNAP has not disclosed the affected component, input field, or arithmetic operation that permits the integer value to overflow or wrap. No prior privileges or user interaction are required; QNAP has not bounded the resulting system alteration or interruption.

The record

CVE
CVE-2024-21905
Published
Apr 26, 2024
Updated
Aug 12, 2024
Vendor
Linn Products Limited
Product
QuTS hero
Classifications
CWE-190, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 26, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

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 privilegesunauthenticated

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=5.1.0 <5.1.3.2578 build 20231110; version=5.1.x <5.1.3.2578 build 20231110

Published CVSS scores

6.5QNAP Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
8.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1190Exploit Public-Facing Application

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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