CVE-2025-54149
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 · uneditedAn uncontrolled resource consumption vulnerability has been reported to affect Qsync Central. If a local 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 confidenceThis is an uncontrolled resource consumption vulnerability (CWE-400) in Qsync Central where a local attacker with a valid user account can exploit insufficient resource limits or controls to launch a denial-of-service attack, causing the service to become unavailable or unresponsive.
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
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:L/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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Identify Qsync Central installed versionAccess the Qnap admin console, navigate to the Qsync Central application settings, and locate the version information typically displayed in the About or System Information section. Alternatively, use the Qnap command line if available to query the installed package version.Affected 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 but < 5.0.0.4)
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Confirm Qsync Central service is runningCheck if the Qsync Central service is active and accepting connections. This can be done by attempting to access the Qsync Central web interface or checking the service status through the Qnap admin panel.Affected if The service is running and accessible (vulnerability requires an active Qsync Central service)
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Verify local user account access existsReview the list of local users configured in Qsync Central through the admin console. Identify whether any local user accounts exist with valid credentials that could be used for authentication.Affected if Local user accounts are present in the system (exploitation requires a valid local user account)
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Monitor for service responsiveness issuesTest Qsync Central responsiveness by attempting file sync operations or accessing the web interface. Observe if the service becomes unresponsive or experiences significant delays.Affected if The service shows signs of unresponsiveness or slow processing that could indicate resource exhaustion from exploitation
A system is affected if Qsync Central version is 5.0.0.0 through 5.0.0.3 and the service is running with local user accounts accessible.
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 then, restrict local account access and monitor for unusual resource usage patterns that could indicate exploitation.
Qsync Central 5.0.0.4 or later
- Back up current Qsync Central configuration and data before proceeding with the upgrade
- Download Qsync Central version 5.0.0.4 (released 2026/01/20) or later from the official QNAP website
- Access the Qsync Central administration interface and navigate to the firmware/software update section
- Apply the upgrade to Qsync Central version 5.0.0.4 or later
- After the upgrade completes, verify that the installed version is 5.0.0.4 or higher
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
- Implementation2.0 h
- Testing1.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-54149 — 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-2025-54149 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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