CVE-2025-44008
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 5.0.0.1 ( 2025/07/09 ) 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 NULL pointer dereference vulnerability in Qsync Central that allows an authenticated remote attacker with a valid user account to crash the application, causing a denial-of-service condition. The vulnerability stems from improper validation or handling that leads to dereferencing a null pointer during certain operations.
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>= 4.2.0.0, < 5.0.0.1CVSS 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 installedCheck if Qsync Central is present on the QNAP system. This can be done via the QNAP App Center or by checking for the Qsync Central process/service running on the system.Affected if Qsync Central is not installed or not running
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Determine installed versionLocate the version of Qsync Central installed. This is typically viewable in the QNAP App Center, or via the Qsync Central web interface under System Settings > About, or by querying the Qsync service directly.Affected if Version cannot be determined or is not visible
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Compare version to affected rangeCheck if the installed version falls within >= 4.2.0.0 and < 5.0.0.1. Any version from 4.2.0.0 up to but not including 5.0.0.1 is affected.Affected if Installed version is 4.2.0.0 or higher but lower than 5.0.0.1
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Confirm user account configurationVerify whether user accounts are enabled in Qsync Central. Check System Settings > User Management in the Qsync Central interface, or review if LDAP/local user authentication is active for Qsync services.Affected if User accounts are configured and enabled in Qsync Central
The environment is affected if Qsync Central is installed with a version between 4.2.0.0 and 5.0.0.1 (exclusive) and user accounts are enabled, since a valid user account is required to exploit this vulnerability.
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 · scoped5.0.0.1
Upgrade Qsync Central to version 5.0.0.1 or later. Additionally, limit user account creation and enforce strong authentication to reduce the attack surface, as a valid user account is required to exploit this vulnerability.
Qsync Central 5.0.0.1
- 1. Back up the current Qsync Central configuration and any important data
- 2. Log in to the QNAP NAS admin interface
- 3. Navigate to the App Center or Qsync Central management page
- 4. Check the current installed version to confirm it is below 5.0.0.1
- 5. Update Qsync Central to version 5.0.0.1 or later via the QNAP App Center, or manually download and install the update from QNAP's official download center
- 6. After installation completes, verify that Qsync Central is now running version 5.0.0.1 or later
- 7. Test that Qsync Central functionality is working normally
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-2025-44008 — 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-2025-44008 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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