CVE-2024-50404
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 link following vulnerability has been reported to affect Qsync Central. If exploited, the vulnerability could allow remote attackers who have gained user access to traverse the file system to unintended locations. We have already fixed the vulnerability in the following versions: Qsync Central 4.4.0.16_20240819 ( 2024/08/19 ) 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 confidenceThis is a link following (symlink) vulnerability in Qsync Central that allows authenticated remote users to traverse the file system beyond intended boundaries by exploiting symbolic link handling. The vulnerability has a high CVSS score of 8.8 due to the potential for unauthorized file system access.
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>= 4.4.0, < 4.4.0.16CVSS 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
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/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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Identify Qsync Central versionAccess the Qsync Central admin interface and navigate to the Control Panel or About section to view the installed version number, or use the QNAP CLI command 'qpkgs' or check the installed package version via the QNAP App Center.Affected if The installed version is 4.4.0 or higher but lower than 4.4.0.16
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Confirm Qsync service is activeVerify that the Qsync Central application is running on the QNAP device. This can be done via the QNAP admin interface under Services or by checking process status via SSH with 'ps | grep qsync' or similar.Affected if Qsync Central is installed and running, meeting the version condition above
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Review sync folder permissionsCheck the configured sync directories on the NAS. Navigate to Qsync Central settings and review the list of synchronized folders and their sharing permissions, particularly any folders shared with user-level access.Affected if Users have been granted access to sync directories, providing potential attack surface for authenticated exploitation
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Audit for suspicious symbolic linksInspect sync directories on the NAS filesystem for any symbolic links that point outside the intended sync folder hierarchy. Use 'find /path/to/sync/folder -type l -ls' via SSH to list all symlinks and verify their targets with 'readlink -f <symlink>'.Affected if Symlinks exist within sync directories that point to locations outside the intended sync boundary
The environment is affected if Qsync Central version 4.4.0 through 4.4.0.15 is installed and the Qsync service is active with users having access to sync directories.
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 · scoped4.4.0.16
Update Qsync Central to version 4.4.0.16_20240819 or later. If immediate patching is not possible, limit user access to Qsync Central and monitor for suspicious file system activity.
Qsync Central 4.4.0.16_20240819 or later
- Identify the current version of Qsync Central installed on the NAS
- Access the QNAP download center at www.qnap.com and navigate to the Qsync Central download page
- Download Qsync Central version 4.4.0.16_20240819 or later
- Log into the QNAP admin interface (QTS or QuTScloud)
- Open App Center and locate Qsync Central
- Stop the Qsync Central service if prompted
- Install the downloaded updated version
- Restart the Qsync Central service after installation completes
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2024-50404 — 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-2024-50404 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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