CVE-2025-52868
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 buffer overflow vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to modify memory or crash processes. 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 confidenceBuffer overflow vulnerability in Qsync Central allowing an authenticated remote attacker to modify memory or crash processes. The vulnerability stems from insufficient bounds checking in the affected component, enabling memory corruption when processing specific inputs.
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
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/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 installedLocate Qsync Central on the QNAP system through the App Center or by checking for the qsync process/service running on the deviceAffected if Qsync Central is not installed on the system, the vulnerability does not apply
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Identify the installed version of Qsync CentralAccess Qsync Central through the QNAP admin interface, go to the version information section, or use the QNAP CLI tools to query the package versionAffected if The version cannot be determined or the software is not present
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Compare the installed version against the affected rangeCheck if the installed version falls within >= 5.0.0.0 and < 5.0.0.4. Versions 5.0.0.0, 5.0.0.1, 5.0.0.2, and 5.0.0.3 are affectedAffected if The installed version is 5.0.0.0, 5.0.0.1, 5.0.0.2, or 5.0.0.3, meaning the system is vulnerable
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Confirm remote access to Qsync Central is enabledVerify that Qsync Central is accessible over the network to remote users, as exploitation requires an authenticated remote attacker with a valid user accountAffected if Remote access to Qsync Central is exposed to untrusted networks and user authentication is enabled
The environment is affected if Qsync Central version 5.0.0.0 through 5.0.0.3 is installed and the service is accessible to remote 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 to Qsync Central version 5.0.0.4 or later. Since exploitation requires a valid user account, enforce strong password policies and implement network segmentation to limit exposure to unauthenticated attackers.
Qsync Central 5.0.0.4
- Log in to the QNAP NAS web interface with administrator credentials
- Navigate to the Qsync Central application
- Access the Control Panel or Settings for Qsync Central
- Check the current version (should be >= 5.0.0.0 and < 5.0.0.4)
- Locate the firmware/update option within Qsync Central settings
- Apply the update to Qsync Central version 5.0.0.4 or later
- Verify the installed version after update completion
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-52868 — 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-2025-52868 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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