CVE-2025-52869
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 buffer overflow vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to modify memory or crash processes. 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 buffer overflow vulnerability exists in Qsync Central that allows an authenticated remote attacker to modify memory or crash processes. The vulnerability can be exploited after the attacker gains a valid user account on the system.
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
- None
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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.
-
Verify Qsync Central is installedOn the QNAP NAS, check if Qsync Central is installed via the App Center or by examining running processes (look for qsync or qsnc processes).Affected if Qsync Central is not installed on the system, the CVE does not apply.
-
Locate the installed version numberAccess Qsync Central via the QNAP admin interface (usually at https://[nas-ip]:[port]/qsync) and navigate to the Control Panel > Applications > Qsync Central, or use the QNAP CLI tool 'qpkg --info Qsync_Central' to retrieve the package version.Affected if Unable to determine the version means you cannot confirm if the vulnerability applies.
-
Compare against affected versionsCheck if the installed version is 5.0.0.0, 5.0.0.1, 5.0.0.2, or 5.0.0.3. Any of these versions fall within the vulnerable range.Affected if Installed version is 5.0.0.0 through 5.0.0.3 inclusive.
-
Confirm user account accessibilityReview Qsync Central user accounts and authentication logs to determine if untrusted or compromised accounts could exist with access to the Qsync service.Affected if The vulnerability requires an authenticated attacker, so assess whether untrusted users could obtain valid credentials.
You are affected if Qsync Central version 5.0.0.0 through 5.0.0.3 is installed and untrusted or compromised user accounts could potentially authenticate to the service.
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 (released 2026/01/20) or later to remediate this vulnerability. Until then, limit access to trusted users only and monitor for suspicious activity.
Qsync Central 5.0.0.4 and later
- Identify the current version of Qsync Central installed on the system
- If the installed version is >= 5.0.0.0 and < 5.0.0.4, initiate an upgrade to version 5.0.0.4 or later
- Follow QNAP's standard upgrade procedure for Qsync Central (typically via the QTS Control Center or QNAP software center)
- After upgrade, verify the version has been successfully updated to 5.0.0.4 or later
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation2.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,752.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-52869 — 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-2025-52869 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
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.
- 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