CVE-2025-54147
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 · uneditedA NULL pointer dereference vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to launch a denial-of-service (DoS) attack. We have already fixed the vulnerability in the following version: Qsync Central 5.0.0.4 ( 2026/01/20 ) 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 confidenceA NULL pointer dereference vulnerability exists in Qsync Central that allows an authenticated remote attacker to cause a denial-of-service condition. The vulnerability is triggered when the attacker, after gaining a valid user account, exploits the NULL pointer dereference in the application's handling of certain operations.
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>= 5.0.0.0, < 5.0.0.4CVSS 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 checksWork through these to decide whether this CVE applies to you.
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Check Qsync Central installed versionAccess the QNAP admin interface, navigate to the Qsync Central app, and view the version information, or use the QNAP command line to query the installed package versionAffected if The installed version is 5.0.0.0, 5.0.0.1, 5.0.0.2, or 5.0.0.3 (any version >= 5.0.0.0 and less than 5.0.0.4)
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Confirm Qsync Central service is runningVerify the Qsync Central service is active on the QNAP NAS deviceAffected if The service is running and accessible on the network
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Verify user authentication is configuredCheck that user accounts are created and authentication is enabled for Qsync Central accessAffected if Valid user accounts exist in the system, as the attacker requires a valid user account to exploit the vulnerability
The environment is affected if Qsync Central version is 5.0.0.0 through 5.0.0.3 and the service is running with user authentication enabled.
Generated from the published advisory. Verify against your own configuration.
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 · scoped5.0.0.4
Upgrade Qsync Central to version 5.0.0.4 or later. Prior to upgrading, ensure valid backups of configuration and data exist, and schedule the upgrade during a maintenance window to minimize business impact.
Qsync Central 5.0.0.4 or later
- 1. Identify the current version of Qsync Central installed on your QNAP NAS by accessing the Qsync Central web interface or checking via QNAP's interface.
- 2. Navigate to the QNAP download center at www.qnap.com and locate Qsync Central version 5.0.0.4 or later.
- 3. Download the appropriate firmware/update package for your QNAP NAS model.
- 4. Install the update by accessing the Qsync Central admin interface and applying the update, or use QNAP's firmware update mechanism.
- 5. After installation, verify that Qsync Central has been updated to version 5.0.0.4 or later.
- 6. Confirm the vulnerability is remediated by verifying the service is running normally without unexpected restarts or errors.
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-54147 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-54147 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- 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
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