CVE-2025-33034
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 5.0.0.1 ( 2025/07/09 ) 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 an authenticated remote attacker to access arbitrary files on the system by using traversal sequences (e.g., ../../../') in file paths, potentially exposing sensitive system data beyond the intended sync directories.
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>= 4.2.0.0, < 5.0.0.1CVSS 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 if Qsync Central is installedOn the QNAP NAS, check for Qsync Central application via the App Center or by looking for the qsync process in running processes. The web interface typically runs on port 8080 or 443.Affected if Qsync Central is installed and running on the system
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Determine the installed Qsync Central versionAccess the Qsync Central admin interface and navigate to the Control Panel or About section to view the software version. Alternatively, check the installed package information via QNAP's command line if available.Affected if The installed version falls within the range >= 4.2.0.0 and < 5.0.0.1
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Verify the Qsync Central web interface is network accessibleCheck if the Qsync Central web portal (typically accessed via the NAS IP or myqnapcloud link on port 8080/443) is reachable from network locations. Confirm whether firewall rules allow external access.Affected if The Qsync Central web interface is exposed to network-accessible IPs beyond the local administrative network
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Confirm user authentication is configuredReview the Qsync Central user management settings to verify that user accounts exist and authentication is required for access. The vulnerability requires valid credentials to exploit.Affected if Valid user accounts are configured for Qsync Central access (authentication is required for exploitation)
You are affected if Qsync Central is installed with a version between 4.2.0.0 and 5.0.0.1 (exclusive), the web interface is network-accessible, and user authentication is configured.
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 · scoped5.0.0.1
Upgrade Qsync Central to version 5.0.0.1 or later. Until patched, restrict network access to the Qsync Central interface and enforce strong user authentication to reduce the risk of credential compromise.
Qsync Central 5.0.0.1
- Log in to the QNAP NAS admin interface
- Navigate to Qsync Central application management
- Check current installed version to confirm it is between 4.2.0.0 and 5.0.0.0
- Download Qsync Central version 5.0.0.1 or later from the official QNAP download center
- Apply the update through the QNAP App Center or firmware update mechanism
- Verify the installed version shows 5.0.0.1 or later after update
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation3.0 h
- Testing3.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-33034 — 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-2025-33034 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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