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Qsync CentralApplication · Qnap

CVE-2025-33037

MEDIUM · 6.5 CVSS v3.1 Published 2025-08-29
Fix available
A fix is available. Upgrade to 4.5.0.7 or later.
See remediation →
71/100
Remediation priority · Elevated
Remotely reachable Zero-click

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 · unedited
A 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 · high confidence

Qsync Central contains a path traversal vulnerability that allows an authenticated remote attacker to access files outside the intended directory by manipulating file path references (e.g., using '../' sequences). This could enable unauthorized reading of sensitive system files or configuration data.

MitigationUpgrade to Qsync Central version 4.5.0.7 or later. If immediate patching is not feasible, enforce strict user account controls and implement file access logging to detect suspicious path patterns.

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
Qsync CentralApplication
Affected:>= 4.5.0.3, < 4.5.0.7

CVSS 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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify installed Qsync Central version
    Access QNAP Admin UI, navigate to App Center, find Qsync Central in the installed applications list, and record the version number displayed. Alternatively, check via CLI if available.
    Affected if The installed version is 4.5.0.3, 4.5.0.4, 4.5.0.5, or 4.5.0.6 (any version >= 4.5.0.3 but < 4.5.0.7)
  2. Confirm Qsync Central service is active
    Log into QNAP Admin UI, check if Qsync Central is installed and the service is running. Look for the application in the main dashboard or App Center status.
    Affected if Qsync Central is installed and the service is running - the vulnerability only applies to active instances
  3. Verify remote access to Qsync Central is enabled
    Check QNAP network settings and Qsync Central configuration to determine if remote/network access is permitted. Look for port forwarding rules or Qsync remote access settings.
    Affected if Remote access to Qsync Central is enabled, allowing network-based attackers to reach the application
  4. Review access logs for path traversal patterns
    Examine Qsync Central logs and QNAP system logs for entries containing '../' or similar path traversal sequences in file access requests. Check logs under /share/Log or via QNAP Log Center.
    Affected if Logs show suspicious path patterns like '../' in file access requests, indicating potential exploitation attempts

You are affected if Qsync Central version is 4.5.0.3 through 4.5.0.6, the service is running, and remote access to Qsync Central is enabled.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Upgrade available Upgrade to 4.5.0.7 or later
Fixed in 4.5.0.7
Interim mitigation

Upgrade to Qsync Central version 4.5.0.7 or later. If immediate patching is not feasible, enforce strict user account controls and implement file access logging to detect suspicious path patterns.

Recommended fix High confidence

Qsync Central 4.5.0.7 or later

  1. 1. Check the current version of Qsync Central installed on your QNAP device
  2. 2. If the installed version is 4.5.0.3, 4.5.0.4, 4.5.0.5, or 4.5.0.6, the system is vulnerable and requires updating
  3. 3. Access the QNAP administrative interface (QTS or QuTS hero)
  4. 4. Navigate to the App Center or the Qsync Central application management area
  5. 5. Check for available updates for Qsync Central
  6. 6. Update Qsync Central to version 4.5.0.7 or later
  7. 7. After updating, verify the installed version confirms 4.5.0.7 or newer is running

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Qsync Central Scoped from the published advisory
  • Consultation4.0 h
  • Implementation6.0 h
  • Testing6.0 h
  • Review / QA3.0 h
19.0 hours of engineering $3,320
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-33037 in production — separate from our analysis above.

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What this is

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.

What belongs here
  • 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