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Qsync CentralApplication · Qnap

CVE-2025-44007

MEDIUM · 6.5 CVSS v3.1 Published 2025-10-03
Fix available
A fix is available. Upgrade to 5.0.0.1 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 5.0.0.1 ( 2025/07/09 ) 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 · moderate confidence

This is a resource exhaustion vulnerability in Qsync Central where the application fails to implement proper limits or throttling on resource allocation. If a remote attacker obtains valid user credentials, they can exploit this to consume excessive resources (memory, CPU, file handles, etc.), denying other legitimate users or processes access to the same resources.

MitigationUpgrade Qsync Central to version 5.0.0.1 (2025/07/09) or later. Until upgrade is possible, restrict network access to Qsync Central and enforce strong account credentials to minimize the risk of account compromise.

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:>= 4.2.0.0, < 5.0.0.1

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
    Log into the QNAP NAS admin interface and navigate to App Center or Control Panel to verify Qsync Central is installed and running.
    Affected if Qsync Central is not installed, the check is not applicable.
  2. Identify installed Qsync Central version
    In the QNAP admin interface, go to Qsync Central > Settings or About section to view the installed version number.
    Affected if Unable to retrieve version information.
  3. Compare version against affected range
    Check if the installed version is >= 4.2.0.0 and < 5.0.0.1. The version format typically appears as four numbers (e.g., 4.3.1.0123).
    Affected if Version falls within >= 4.2.0.0 and < 5.0.0.1.
  4. Verify remote access configuration
    In Qsync Central settings, check if remote access or sync functionality that allows external connections is enabled.
    Affected if Remote access is enabled and version is in affected range.
  5. Monitor for resource exhaustion symptoms
    Use QNAP Resource Monitor or system tools to check for unusual CPU, memory, or file handle consumption by the Qsync Central processes.
    Affected if Processes are consuming excessive resources and version is in affected range.

You are affected if Qsync Central version is 4.2.0.0 or higher but below 5.0.0.1 and remote access is enabled or credentials could be obtained 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 5.0.0.1 or later
Fixed in 5.0.0.1
Interim mitigation

Upgrade Qsync Central to version 5.0.0.1 (2025/07/09) or later. Until upgrade is possible, restrict network access to Qsync Central and enforce strong account credentials to minimize the risk of account compromise.

Recommended fix High confidence

Qsync Central 5.0.0.1

  1. Identify the current Qsync Central version installed
  2. Download Qsync Central version 5.0.0.1 or later from the official QNAP website
  3. Review QNAP's upgrade documentation for Qsync Central
  4. Perform the upgrade following standard QNAP upgrade procedures
  5. Verify the upgrade was successful and the version is now 5.0.0.1 or later
  6. Confirm the vulnerability is no longer present

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
  • Implementation4.0 h
  • Testing4.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,080
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,328.

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-2025-44007 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