CVE-2025-33038
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 4.5.0.7 ( 2025/04/23 ) 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 manipulate file path references using directory traversal sequences (e.g., '../') to access files outside the intended directory scope. An attacker with valid user credentials can read arbitrary files on the system including sensitive configuration or system 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>= 4.5.0.3, < 4.5.0.7CVSS 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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Identify Qsync Central versionLog into the QNAP admin interface, navigate to Qsync Central, and locate the version information typically displayed in the About or Settings section. Alternatively, check the Qsync Central package management interface for the installed version.Affected if The displayed version is 4.5.0.3, 4.5.0.4, 4.5.0.5, or 4.5.0.6 (any version from 4.5.0.3 up to but not including 4.5.0.7)
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Confirm Qsync Central service is runningAccess the QNAP NAS admin portal and verify that the Qsync Central application is installed and the service is running/enabled.Affected if Qsync Central is actively running and accessible on the network
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Verify user authentication is enabledCheck the Qsync Central user management settings to confirm that user authentication is configured, as this vulnerability requires valid user credentials for exploitation.Affected if User authentication is enabled and valid user accounts exist in the system
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Check for exposure to untrusted networksDetermine if the Qsync Central web interface is accessible from external or untrusted networks, rather than being restricted to a trusted internal network only.Affected if Qsync Central is reachable from outside the trusted network boundary
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Review access logs for path traversal patternsExamine Qsync Central or QNAP system logs for any requests containing '../' or similar directory traversal sequences, particularly those from authenticated user sessions.Affected if Log entries show suspicious path traversal attempts in file access requests
A user is affected if Qsync Central version is 4.5.0.3 through 4.5.0.6, the service is running, and the attacker can authenticate with valid credentials to exploit the path traversal flaw.
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 · scoped4.5.0.7
Upgrade Qsync Central to version 4.5.0.7 or later. If immediate patching is not feasible, limit user account privileges and implement monitoring for anomalous file access patterns involving path traversal characters.
Qsync Central 4.5.0.7 or later
- Log in to the QNAP NAS admin interface as an administrator
- Navigate to Qsync Central application settings
- Check for available updates or manually verify the current Qsync Central version
- Upgrade Qsync Central to version 4.5.0.7 or later via the QNAP update mechanism
- After upgrade, verify the installed Qsync Central version is 4.5.0.7 or higher
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-2025-33038 — 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-2025-33038 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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- Version or environment caveats, and links to real fixes
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