CVE-2021-34349
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 command injection vulnerability has been reported to affect QNAP device running QVR. If exploited, this vulnerability could allow remote attackers to run arbitrary commands. We have already fixed this vulnerability in the following versions of QVR: QVR 5.1.5 build 20210803 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 confidenceThis is a command injection vulnerability in QNAP QVR (video surveillance software) where user-supplied input is improperly handled and passed to system shell commands. An attacker can inject arbitrary OS commands, potentially achieving remote code execution with the privileges of the affected service.
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< 5.1.5CVSS 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
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:H/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 QVR is installedAccess your QNAP NAS admin interface and check if QVR (QVR Pro or QVR Elite) is installed and running. You can also check for QVR-related processes on the NAS via SSH.Affected if QVR software is present on the system
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Check QVR version numberLog into the QVR web management interface and navigate to the system settings or about section to view the installed QVR version. Compare the version number to 5.1.5.Affected if The displayed QVR version is lower than 5.1.5 or the version cannot be determined to be 5.1.5 or higher
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Verify web interface accessibilityConfirm whether the QVR management web interface (typically ports 8080 or 443) is accessible from network segments that contain untrusted users.Affected if The QVR web interface is exposed to untrusted networks without proper access controls
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Check for suspicious command execution logsReview QVR and system logs for any unexpected command executions, unusual shell script activity, or signs of injection attempts in QVR-related log files.Affected if Logs show unfamiliar commands or injection patterns executed under the QVR service account
You are affected if QVR is installed and the version is lower than 5.1.5, or if you cannot confirm the version meets or exceeds 5.1.5.
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 · scoped5.1.5
Apply QVR firmware update to version 5.1.5 build 20210803 or later. If immediate patching is not possible, restrict network access to QVR management interfaces and disable unauthenticated remote access features.
QVR 5.1.5 build 20210803 or later
- Verify the current QVR version installed on the QNAP device
- Access the QNAP admin interface and navigate to QVR settings
- Check for firmware/software updates within the QVR application
- Download and install QVR 5.1.5 build 20210803 or later
- After upgrade, verify the new version is running to confirm remediation
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 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 $5,120.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-34349 — 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-2021-34349 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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