CVE-2023-51368Network attack vector

Network denial of service via NULL pointer dereference

Published Sep 6, 2024 · Updated Sep 6, 2024

NULL pointer dereference in QNAP QTS 5.1.x and QuTS hero h5.1.x allows remote attackers to interrupt NAS service via a network. QNAP has not published the affected component or the network input that reaches the invalid pointer dereference. No authentication or user interaction is required under QNAP's assessment, but high attack complexity limits reachability and the reported consequence is service interruption.

CVSS severity5.4
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in QNAP QTS 5.1.x and QuTS hero h5.1.x allows remote attackers to interrupt NAS service via a network. QNAP has not published the affected component or the network input that reaches the invalid pointer dereference. No authentication or user interaction is required under QNAP's assessment, but high attack complexity limits reachability and the reported consequence is service interruption.

The record

CVE
CVE-2023-51368
Published
Sep 6, 2024
Updated
Sep 6, 2024
Vendor
Linn Products Limited
Product
QuTS hero
Classifications
CWE-476, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 6, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 6, 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=h5.1.x <h5.1.6.2734 build 20240414

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Linn Products Limited · QuTS heroversion=h5.1.x <h5.1.6.2734 build 20240414
Linn Products Limited · QTSversion=5.1.x <5.1.6.2722 build 20240402

Published CVSS scores

5.4QNAP Systems, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:L
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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