CVE-2025-30262Network attack vector

Authenticated denial of service via NULL pointer dereference

Published Aug 29, 2025 · Updated Aug 29, 2025

NULL pointer dereference in QNAP Qsync Central before 5.0.0.0 allows remote authenticated users to interrupt the service over a network. QNAP has not published the affected endpoint, function, or input that reaches the NULL pointer dereference. A Qsync user account is required, and the reported consequence is limited to service interruption with no disclosed data access or code execution.

CVSS severity5.3
Medium
EPSS probability0.45%
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 Qsync Central before 5.0.0.0 allows remote authenticated users to interrupt the service over a network. QNAP has not published the affected endpoint, function, or input that reaches the NULL pointer dereference. A Qsync user account is required, and the reported consequence is limited to service interruption with no disclosed data access or code execution.

The record

CVE
CVE-2025-30262
Published
Aug 29, 2025
Updated
Aug 29, 2025
Vendor
Linn Products Limited
Product
Qsync Central
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=5.0.x.x <5.0.0.0 ( 2025/06/13 )

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Linn Products Limited · Qsync Centralversion=5.0.x.x <5.0.0.0 ( 2025/06/13 )

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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