CVE-2021-38684
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 stack buffer overflow vulnerability has been reported to affect QNAP NAS running Multimedia Console. If exploited, this vulnerability allows attackers to execute arbitrary code. We have already fixed this vulnerability in the following versions of Multimedia Console: Multimedia Console 1.4.3 ( 2021/10/05 ) and later Multimedia Console 1.5.3 ( 2021/10/05 ) 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 confidenceA stack buffer overflow vulnerability in QNAP NAS Multimedia Console allows remote attackers to execute arbitrary code via malformed input, potentially leading to complete system compromise.
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< 1.4.3= 1.5.2CVSS 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
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/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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Verify Multimedia Console is installedAccess QNAP QTS Web UI, go to App Center, and look for Multimedia Console in the installed applications list. Alternatively, run 'qpkg -e' via SSH to list installed QNAP packages and grep for 'Multimedia_Console'Affected if Multimedia Console does not appear in the installed applications list
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Identify installed Multimedia Console versionIn QTS App Center, click on Multimedia Console and view the version information displayed. Alternatively, run 'qpkg -i Multimedia_Console' via SSH to retrieve package details including versionAffected if Unable to retrieve version information or version field is empty
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Compare version against affected rangesExamine the version number obtained from step 2. Affected versions are: any version less than 1.4.3 (such as 1.4.2, 1.4.1, 1.0.x), OR exactly version 1.5.2Affected if Installed version is below 1.4.3 OR installed version equals exactly 1.5.2
A QNAP NAS is affected if Multimedia Console is installed and the installed version is either less than 1.4.3 or exactly 1.5.2
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 · scoped1.4.3
Update Multimedia Console to version 1.4.3 or 1.5.3 (released 2021/10/05) or later to patch the vulnerability.
Multimedia Console 1.4.3 or later, or Multimedia Console 1.5.3 or later
- Log in to the QNAP NAS as an administrator
- Open App Center from the main menu
- Search for Multimedia Console in the available applications
- If an update is available, click on Multimedia Console and select Update
- Confirm the update to install version 1.4.3 or later (or 1.5.3 or later if already on 1.5.x)
- Wait for the update to complete and verify the new version in App Center > My Apps
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2021-38684 — 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-2021-38684 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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