CVE-2025-30267Network attack vector

Authenticated denial of service via NULL dereference

Published Aug 29, 2025 · Updated Aug 29, 2025

NULL pointer dereference in QNAP QTS 5.2.x and QuTS hero h5.2.x allows remote authenticated users to interrupt NAS service. QNAP has not disclosed the affected component, request field, or operation that dereferences the NULL pointer. A valid user account is required, and exploitation causes a service interrupt; the vendor does not state whether the result is a process crash, system hang, or reboot.

CVSS severity5.3
Medium
EPSS probability0.36%
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 5.2.x and QuTS hero h5.2.x allows remote authenticated users to interrupt NAS service. QNAP has not disclosed the affected component, request field, or operation that dereferences the NULL pointer. A valid user account is required, and exploitation causes a service interrupt; the vendor does not state whether the result is a process crash, system hang, or reboot.

The record

CVE
CVE-2025-30267
Published
Aug 29, 2025
Updated
Aug 29, 2025
Vendor
Linn Products Limited
Product
QuTS hero
Classifications
CWE-476, CAPEC-129, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 29, 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=h5.2.x <h5.2.5.3138 build 20250519

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Linn Products Limited · QuTS heroversion=h5.2.x <h5.2.5.3138 build 20250519
Linn Products Limited · QTSversion=5.2.x <5.2.5.3145 build 20250526

Published CVSS scores

5.3QNAP Systems, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
6.5NIST National Vulnerability DatabaseCVSS: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
CAPEC-129Pointer Manipulation
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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