CVE-2025-30262
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 5.0.0.0 ( 2025/06/13 ) 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 Qsync Central that can be exploited by a remote attacker who has obtained a valid user account. The vulnerability leads to a denial-of-service condition when the NULL pointer is dereferenced during attack execution.
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= 5.0.0.0CVSS 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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Confirm Qsync Central installationLocate Qsync Central on the QNAP NAS - typically accessible via the App Center or by checking running services on the NAS management interface.Affected if Qsync Central is installed on the QNAP device.
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Identify installed Qsync Central versionAccess Qsync Central through the NAS web interface, then navigate to the settings or about section to view the software version number.Affected if The installed version is exactly 5.0.0.0.
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Verify remote access configurationCheck Qsync Central settings to determine if remote synchronization or web-based access is enabled, which would allow remote attacker access.Affected if Remote access to Qsync Central is enabled and exposed to network.
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Review user account configurationExamine the user accounts configured in Qsync Central - check for any accounts that have sync permissions and could be targeted for credential theft.Affected if There are active user accounts with Qsync access, particularly if those accounts have weak credentials or no MFA protection.
You are affected only if Qsync Central version 5.0.0.0 is installed AND remote network access is available AND a valid user account exists that could be compromised by an attacker.
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 · scopedUpdate Qsync Central to version 5.0.0.0 or later. Additionally, enforce strong account security controls (MFA, strong passwords, account lockout policies) to make initial account compromise more difficult, as the attacker needs a valid user account to exploit this vulnerability.
Qsync Central 5.0.0.0 (2025/06/13) or later
- 1. Log into the QNAP NAS administration interface
- 2. Navigate to the Qsync Central application settings
- 3. Check the current installed version of Qsync Central
- 4. Download and install Qsync Central version 5.0.0.0 (released 2025/06/13) or later from the QNAP download center
- 5. Verify the installation by checking the updated version number in the Qsync Central settings
- 6. Restart the Qsync Central service if prompted to ensure the vulnerability is remediated
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
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-30262 — 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-2025-30262 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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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
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