CVE-2025-48722
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 5.0.0.4 ( 2026/01/20 ) 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 authenticated remote attackers to cause a denial-of-service condition by triggering the NULL pointer during specific operations after gaining a valid user account.
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>= 5.0.0.0, < 5.0.0.4CVSS 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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Locate Qsync Central installationIdentify where Qsync Central is installed on your QNAP device. Common locations include the App Center or the system volume. Check the QNAP administrative interface for installed apps.Affected if Qsync Central is installed and running on the system
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Determine installed Qsync Central versionAccess the QNAP admin console, navigate to Qsync Central, and locate the version information typically displayed in the application details or about section. Note the full version number including build numbers.Affected if The installed version is 5.0.0.0 through 5.0.0.3 (any version >= 5.0.0.0 but < 5.0.0.4)
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Verify user account authentication is enabledCheck if user authentication is configured for Qsync Central. Review the user account settings to confirm valid user accounts exist and authentication is required for access.Affected if Valid user accounts are present and authentication is required for Qsync Central access
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Monitor for service availabilityObserve Qsync Central for unexpected crashes or service interruptions. Check system logs for entries indicating NULL pointer dereference errors or unexpected termination of the Qsync Central service.Affected if The service becomes unavailable or crashes unexpectedly after user authentication operations
You are affected if Qsync Central version is 5.0.0.0, 5.0.0.1, 5.0.0.2, or 5.0.0.3 and the service is accessible to authenticated users.
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 · scoped5.0.0.4
Upgrade Qsync Central to version 5.0.0.4 or later. If immediate patching is not feasible, implement network segmentation and monitor for unusual authentication patterns that may indicate account compromise.
Qsync Central 5.0.0.4
- 1. Check the current version of Qsync Central installed on the system
- 2. If the version is below 5.0.0.4, download Qsync Central version 5.0.0.4 or later from the official QNAP website
- 3. Install the updated Qsync Central version following QNAP's standard upgrade procedures
- 4. Verify that the installed version is 5.0.0.4 or later
- 5. Confirm the service is running properly after the upgrade
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
- Implementation2.0 h
- Testing1.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-48722 — 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-2025-48722 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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