CVE-2025-54148
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 · high confidenceA NULL pointer dereference vulnerability exists in Qsync Central that allows an authenticated remote attacker (attacker must first obtain a valid user account) to trigger a denial-of-service condition by exploiting the NULL pointer dereference in the software.
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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Verify Qsync Central is installedAccess the QNAP NAS admin interface, go to App Center or check running services to confirm Qsync Central is installed and running. Alternatively, check via SSH with 'ps aux | grep -i qsync' or review installed packages.Affected if Qsync Central is found running on the system
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Determine installed Qsync Central versionIn QNAP admin interface, locate Qsync Central in App Center and view the version details. Via CLI, check '/share/CACHEDEV1_DATA/.qpkg/QsyncCentral' or use 'qpkg --info Qsync Central' if available. Compare against the affected range.Affected if Installed version is 5.0.0.0 through 5.0.0.3 (inclusive)
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Confirm user accounts exist on the systemCheck Qsync Central user management or NAS user accounts via the admin interface under 'Users' or 'Domain' settings. Since exploitation requires a valid user account, verify if any user accounts are configured.Affected if At least one user account exists in the system
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Check for remote access exposureReview Qsync Central network settings and NAS firewall rules to determine if the service is accessible from external networks. Verify if the QNAP device has port forwarding enabled or VPN access configured.Affected if Qsync Central is exposed to untrusted networks or remote access is enabled
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Review logs for crash indicatorsCheck Qsync Central logs in the admin interface under 'Log Center' or inspect system logs via CLI in '/var/log/' for qsync-related errors, crashes, or sudden service restarts occurring after the software was deployed.Affected if Recent crashes, NULL pointer errors, or unexpected service restarts are logged for Qsync Central
A system is affected if Qsync Central version 5.0.0.0 through 5.0.0.3 is running and the attacker can obtain valid user credentials to authenticate remotely.
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. Until the upgrade is applied, restrict user account access to trusted personnel and monitor for anomalous activity that could indicate exploitation attempts.
Qsync Central 5.0.0.4
- Back up the current Qsync Central configuration before starting the upgrade process
- Obtain Qsync Central version 5.0.0.4 or later from the official QNAP download center
- Install the updated Qsync Central version following QNAP's standard upgrade procedures
- After upgrade, verify that the Qsync Central service is running normally
- Confirm the version number matches 5.0.0.4 or higher to ensure the vulnerability is patched
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-54148 — 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-2025-54148 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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