CVE-2025-53409
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 allocation of resources without limits or throttling vulnerability has been reported to affect File Station 5. 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: File Station 5 5.5.6.5018 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 a resource exhaustion vulnerability in QNAP File Station 5 where the application fails to properly limit or throttle resource allocation. An authenticated attacker with a valid user account can deliberately consume excessive resources (likely file handles, memory, or storage operations) to prevent other legitimate users from accessing file storage resources, effectively causing a local denial-of-service condition.
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>= 5.5.6.4691, < 5.5.6.5018CVSS 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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Identify File Station versionAccess QNAP Admin Console, go to App Center or File Station settings, locate the installed version number for File Station 5Affected if Version is not shown or cannot be determined for comparison
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Compare version to vulnerable rangeCheck if the installed File Station 5 version falls within >= 5.5.6.4691 and < 5.5.6.5018Affected if Installed version is 5.5.6.4691 through 5.5.6.5017 inclusive
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Confirm authentication is enabledVerify that user account authentication is enabled for File Station access (this is required for the exploit to be usable)Affected if Valid user accounts can authenticate to File Station, allowing authenticated attacker access
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Review resource consumptionMonitor system resources such as file handles, memory usage, and storage operation queues via QNAP Resource Monitor or system logsAffected if Unusually high resource consumption or file operation backlog is observed without legitimate high demand
User is affected if File Station 5 version is between 5.5.6.4691 and 5.5.6.5017 inclusive and authenticated user access is possible.
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 · scoped5.5.6.5018
Update File Station 5 to version 5.5.6.5018 or later. Until the update can be applied, review user account access and monitor for anomalous resource consumption patterns.
File Station 5 version 5.5.6.5018 or later
- Identify the current version of File Station 5 installed on the QNAP device
- Back up critical data and configurations as a precautionary measure before proceeding with the update
- Access the QNAP admin interface and navigate to the File Station application
- Update File Station to version 5.5.6.5018 or later via the built-in update mechanism
- Verify the upgrade was successful by confirming the new version number
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 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-2025-53409 — 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-2025-53409 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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