CVE-2025-68406
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 path traversal vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to read the contents of unexpected files or system data. 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 path traversal vulnerability in Qsync Central allows authenticated remote attackers to access files outside the intended directory by manipulating file paths with '../' sequences. An attacker with valid user credentials can read arbitrary system files, potentially exposing sensitive configuration data.
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
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
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 the Qsync Central installation directory or check the QNAP NAS QTS interface under App Center for the Qsync Central application. On the NAS, common paths include /share/CACHEDEV1_DATA/.qpkg/QsyncCentral or /mnt/ext/opt/qsync_central.Affected if Qsync Central application is present on the system
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Determine installed version of Qsync CentralAccess the QNAP admin interface, go to Qsync Central settings, and locate the version information displayed in the About or System Information section. Alternatively, check the version file within the Qsync Central application directory.Affected if 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 network-accessibleCheck if the Qsync Central web interface port (typically 5230 or 443) is open and listening on network interfaces. Use commands like 'netstat -an | grep -E "5230|443"' or review the QNAP firewall rules under Control Panel > Security > Firewall.Affected if The Qsync Central service is accessible from network segments beyond the local localhost
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Verify user accounts exist for Qsync CentralReview the Qsync Central user list under the application settings or check QNAP QTS user management for accounts with Qsync access privileges.Affected if There are active user accounts configured to access Qsync Central
The environment is affected if Qsync Central version is 5.0.0.0 through 5.0.0.3, the service is network-accessible, and valid user credentials exist for Qsync Central access.
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 upgrading is not possible, restrict network access to the Qsync Central service and implement file access monitoring to detect anomalous read attempts.
Qsync Central 5.0.0.4
- Log in to the QNAP NAS admin interface
- Navigate to the Qsync Central application
- Check the current version under Application > Qsync Central
- Update to version 5.0.0.4 or later via the QNAP App Center or built-in update mechanism
- Verify the update was successful by confirming the installed version is 5.0.0.4 or higher
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
- Implementation1.0 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-2025-68406 — 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-2025-68406 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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