CVE-2025-57709
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 · high confidenceBuffer overflow vulnerability in Qsync Central allowing an authenticated remote attacker to modify memory or crash processes via malformed input. The vulnerability requires prior account compromise to exploit.
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 installedAccess the QNAP admin console and navigate to App Center or check the system logs for Qsync Central package installation.Affected if Qsync Central is not installed on the QNAP device.
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Check Qsync Central versionOpen Qsync Central in the QNAP admin interface and locate the version number displayed in the application settings or about section.Affected if The installed version is 5.0.0.0, 5.0.0.1, 5.0.0.2, or 5.0.0.3 (any version >= 5.0.0.0 but < 5.0.0.4).
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Confirm Qsync Central service is runningCheck the QNAP services status page or use the QNAP CLI to verify Qsync Central process is active.Affected if Qsync Central is running and the version falls within the affected range.
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Assess remote access exposureReview network configuration to determine if Qsync Central is accessible from external networks or if port forwarding exposes it.Affected if Qsync Central is exposed to untrusted networks and the version is within the affected range.
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Verify authentication requirementsCheck that strong password policies and account security measures are in place for QNAP user accounts.Affected if Weak credentials exist and Qsync Central version is within the affected range.
A user is affected if Qsync Central version is 5.0.0.0 through 5.0.0.3 and the service is accessible, especially if account security is weak.
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, restrict network access to Qsync Central and ensure strong credential policies to prevent initial account compromise.
Qsync Central 5.0.0.4
- Identify the current Qsync Central version installed on the QNAP NAS
- Access the QNAP admin interface (QTS or QuTS hero)
- Navigate to the Qsync Central application settings
- Check for updates or install the update to Qsync Central version 5.0.0.4 or later
- Alternatively, download Qsync Central 5.0.0.4 from the official QNAP website and install via the App Center
- Verify the installed version is 5.0.0.4 or later
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-2025-57709 — 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-2025-57709 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
- No spam, self-promotion, credentials, or personal data