CVE-2025-53408
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 File Station 5. 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: 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 · high confidenceA NULL pointer dereference vulnerability in QNAP File Station 5 allows an authenticated remote attacker to cause a denial-of-service condition. The attacker first needs valid user credentials to exploit this flaw.
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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Verify File Station 5 is installedAccess the QNAP admin interface, go to App Center, and look for File Station in the installed applications list. Alternatively, run 'qpkg -i | grep -i file-station' on the NAS command line.Affected if File Station 5 is not found in the application list, then this CVE does not apply.
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Determine the installed File Station 5 versionIn the QNAP App Center, click on File Station and view the version information displayed. From command line, run 'qpkg -i file-station' to retrieve version details.Affected if Unable to retrieve a version number indicates File Station 5 may not be present or accessible.
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Compare version against vulnerable rangeCheck if the installed version falls within >= 5.5.6.4691 AND < 5.5.6.5018. Note the exact version number displayed in the App Center or command output.Affected if Installed version is 5.5.6.4691 or higher but lower than 5.5.6.5018 - the environment is vulnerable.
The system is affected if File Station 5 is installed with a version between 5.5.6.4691 and 5.5.6.5017 inclusive.
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. Ensure user account security to prevent unauthorized access that could enable exploitation.
File Station 5.5.6.5018 or later
- Log into the QNAP NAS web interface using administrator credentials
- Navigate to the App Center or File Station application management section
- Locate File Station 5 in the list of installed applications
- Update File Station to version 5.5.6.5018 or later
- Verify the updated version number after the update completes
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-2025-53408 — 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-2025-53408 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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