CVE-2025-30275
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 4.5.0.7 ( 2025/04/23 ) 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 in Qsync Central allows an authenticated remote attacker with an existing user account to cause a denial-of-service condition, likely through a crafted request triggering the dereference.
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>= 4.5.0.3, < 4.5.0.7CVSS 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 installedAccess the QNAP admin interface and navigate to App Center or the Qsync Central application page to confirm the application is installed.Affected if Qsync Central is not installed, the vulnerability does not apply.
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Check installed Qsync Central versionIn the QNAP admin interface, go to Qsync Central and locate the version information, typically found in the About or Settings section. Alternatively, access the QNAP NAS via SSH and check the package version using the QNAP package management commands if available.Affected if Version is 4.5.0.3 through 4.5.0.6 (inclusive), indicating the system is within the affected range.
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Confirm at least one user account existsIn the QNAP admin interface, navigate to Control Panel > User and Group to verify if any user accounts are configured. Alternatively, check via SSH using 'getent passwd' or the QNAP user management commands.Affected if At least one user account is present in the system, which satisfies the authentication requirement for exploitation.
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Verify Qsync Central is accessible over the networkConfirm that Qsync Central web interface is accessible. Check if port 443 or the configured Qsync Central port is open and responding on the NAS device.Affected if Qsync Central is network-accessible, providing an attack vector for remote exploitation.
The system is affected if Qsync Central version is between 4.5.0.3 and 4.5.0.6 inclusive, the application is accessible, and at least one user account exists in the system.
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 · scoped4.5.0.7
Upgrade Qsync Central to version 4.5.0.7 or later. Implement strong credential policies and restrict user account creation to minimize the attack surface.
Qsync Central 4.5.0.7
- 1. Log in to the QNAP NAS admin interface (QTS).
- 2. Navigate to the App Center or Qsync Central management page.
- 3. Check the currently installed version of Qsync Central to confirm it is >= 4.5.0.3 and < 4.5.0.7.
- 4. Locate Qsync Central in the available updates or manually download Qsync Central version 4.5.0.7 or later from the QNAP website.
- 5. Install or update Qsync Central to version 4.5.0.7 or newer.
- 6. Verify the updated version by checking the Qsync Central application details.
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-2025-30275 — 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-2025-30275 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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