CVE-2026-22899
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 6. 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 5.5.6.5208 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 QNAP File Station 6 that can be exploited by a remote attacker who has obtained valid user credentials. The vulnerability leads to a denial-of-service condition, likely due to the code attempting to dereference a NULL pointer without proper validation.
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, < 5.5.6.5208CVSS 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.
-
Verify File Station is installedAccess the QNAP NAS admin interface and navigate to App Center or the File Station section to confirm File Station is installed and running.Affected if File Station is not installed on the QNAP device, the system is not affected.
-
Determine the installed File Station versionIn the QNAP admin interface, go to App Center, find File Station, and note the version number displayed. Alternatively, use the QNAP QCLI command-line tool if SSH access is available.Affected if Unable to retrieve the version number, further investigation is needed.
-
Compare version against affected rangeCheck if the installed version is >= 5.5.6.4691 AND < 5.5.6.5208. If the version falls within this range, the vulnerability is present.Affected if Version is within >= 5.5.6.4691 and < 5.5.6.5208 - the system is affected by this CVE.
-
Confirm File Station remote access is enabledIn the QNAP admin interface, go to Control Panel > Network Access > Service Binding and verify if File Station is accessible over the network. Also check if Web File Station (web-based access) is enabled in File Station settings.Affected if Remote access is enabled and the version is in the affected range, the vulnerability can be exploited over the network.
-
Verify user accounts with File Station accessCheck the number and configuration of user accounts in Control Panel > Users that have access to File Station. Review whether default or weak credentials exist.Affected if Valid user credentials are required for exploitation; multiple users or weak passwords increase the attack surface.
The system is affected if File Station version is installed and is >= 5.5.6.4691 but < 5.5.6.5208, with remote access enabled and valid user accounts present.
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 · scoped5.5.6.5208
Organizations should ensure File Station is updated to version 5.5.6.5208 or later; alternatively, if staying on File Station 6 is required, apply any available security patches from QNAP. Since authenticated access is required, enforce strong password policies and enable multi-factor authentication to reduce the likelihood of credential compromise.
File Station 5.5.6.5208 or later
- 1. Log into the QNAP NAS admin interface
- 2. Navigate to the App Center or File Station settings
- 3. Check the current File Station version (should be < 5.5.6.5208 if vulnerable)
- 4. Update File Station to version 5.5.6.5208 or later
- 5. Verify the update was successful by checking the File Station version again
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation1.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,224.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-22899 — 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-2026-22899 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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
- No spam, self-promotion, credentials, or personal data