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Qsync CentralApplication · Qnap

CVE-2025-44012

MEDIUM · 6.5 CVSS v3.1 Published 2025-10-03
Fix available
A fix is available. Upgrade to 5.0.0.2 or later.
See remediation →
71/100
Remediation priority · Elevated
Remotely reachable Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
An allocation of resources without limits or throttling vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to prevent other systems, applications, or processes from accessing the same type of resource. We have already fixed the vulnerability in the following version: Qsync Central 5.0.0.2 ( 2025/07/31 ) and later

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

This is a resource exhaustion vulnerability in Qsync Central where the application fails to properly limit or throttle resource allocation. An attacker who has obtained valid user credentials can exploit the lack of resource controls to consume excessive resources, thereby preventing other legitimate systems, applications, or processes from accessing the same type of resource - essentially causing a denial of service.

MitigationUpgrade Qsync Central to version 5.0.0.2 or later. If immediate upgrading is not feasible, implement network-level rate limiting and monitor for anomalous resource consumption patterns that may indicate exploitation.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Qsync CentralApplication
Affected:>= 5.0.0.0, < 5.0.0.2

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Confirm Qsync Central is installed
    Check if Qsync Central is deployed on your QNAP system. This is typically found in the QNAP App Center or as a running service on QNAP NAS devices.
    Affected if Qsync Central is not installed on your system, this CVE does not apply.
  2. Locate the installed version
    Access the Qsync Central interface or QNAP admin panel to view the installed version number. This is usually shown in the application settings, about section, or package manager.
    Affected if You cannot determine the version - verify access permissions or check if the application is running.
  3. Compare version against affected range
    Compare your installed version to the affected range: versions 5.0.0.0 through 5.0.0.1 (any version >= 5.0.0.0 but < 5.0.0.2).
    Affected if Your version falls within 5.0.0.0 to 5.0.0.1, meaning you are running a vulnerable version.
  4. Verify valid credentials exist
    Review user accounts that have valid login credentials for Qsync Central. The attacker requires valid user credentials to exploit this vulnerability.
    Affected if You have active user accounts with Qsync Central access, combined with a vulnerable version, the conditions for exploitation are present.

You are affected if Qsync Central version 5.0.0.0 or 5.0.0.1 is installed and you have valid user accounts that could be leveraged by an attacker.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 5.0.0.2 or later
Fixed in 5.0.0.2
Interim mitigation

Upgrade Qsync Central to version 5.0.0.2 or later. If immediate upgrading is not feasible, implement network-level rate limiting and monitor for anomalous resource consumption patterns that may indicate exploitation.

Recommended fix High confidence

Qsync Central 5.0.0.2

  1. 1. Identify the current version of Qsync Central installed on the QNAP NAS
  2. 2. Navigate to the QNAP App Center or Qsync Central settings
  3. 3. Check for available updates to Qsync Central
  4. 4. Upgrade Qsync Central to version 5.0.0.2 or later (released 2025/07/31)
  5. 5. Verify the installed version is now 5.0.0.2 or higher

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Qsync Central Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
7.0 hours of engineering $1,240
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,984.

Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-44012 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data