CVE-2025-30278Network attack vector

Authenticated service interruption

Published Aug 29, 2025 · Updated Aug 29, 2025

Improper certificate validation in QNAP Qsync Central 4.5.x before 4.5.0.7 allows remote authenticated users to interrupt service. QNAP has not disclosed which certificate-processing locus accepts an invalid certificate or which validation step is omitted. A Qsync Central user account is required, and the published assessment confines direct effects to availability on the NAS and its dependent service.

CVSS severity8.3
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in QNAP Qsync Central 4.5.x before 4.5.0.7 allows remote authenticated users to interrupt service. QNAP has not disclosed which certificate-processing locus accepts an invalid certificate or which validation step is omitted. A Qsync Central user account is required, and the published assessment confines direct effects to availability on the NAS and its dependent service.

The record

CVE
CVE-2025-30278
Published
Aug 29, 2025
Updated
Aug 29, 2025
Vendor
Linn Products Limited
Product
Qsync Central
Classifications
CWE-295, CAPEC-475
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=4.5.x.x <4.5.0.7 ( 2025/04/23 )

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Linn Products Limited · Qsync Centralversion=4.5.x.x <4.5.0.7 ( 2025/04/23 )

Published CVSS scores

8.3QNAP Systems, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation
CAPEC-475Signature Spoofing by Improper Validation

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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