CVE-2021-28811
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 · uneditedIf exploited, this command injection vulnerability could allow remote attackers to run arbitrary commands. Roon Labs has already fixed this vulnerability in the following versions: Roon Server 2021-05-18 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 command injection vulnerability in Roon Server that allows remote attackers to execute arbitrary commands on the affected system. The vulnerability stems from insufficient input validation allowing malicious commands to be injected and executed 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< 2021-05-18CVSS 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 Roon Server is installedLocate Roon Server on the system - common locations include /opt/RoonServer, /Library/Application Support/RoonServer, or as a Docker container. Check running processes for 'RoonServer' or 'roonserver' processes.Affected if Roon Server is found running or installed on the system
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Determine installed Roon Server versionCheck the version of Roon Server. This is typically visible in the Roon Server UI, in installation logs, or in version files within the Roon Server application directory (often named 'version' or displayed in the server's about/info section).Affected if The version cannot be determined or is older than 2021-05-18
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Compare version to affected rangeReview the installed version against the affected range. Versions prior to the 2021-05-18 release are vulnerable.Affected if Installed version is earlier than 2021-05-18 (for example, 2021-04-xx, 2021-03-xx, or any version from 2020)
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Assess network exposureDetermine if Roon Server is accessible from network locations where remote attackers could reach it. Roon Server typically listens on ports 9100-9200 for Roon audio streaming protocols.Affected if Roon Server is exposed to untrusted networks without firewall protection
The system is affected if Roon Server is installed with a version earlier than 2021-05-18 and is reachable by potential attackers.
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.
From vendor data2021-05-18
Upgrade Roon Server to version 2021-05-18 or later to remediate this vulnerability.
- Consultation1.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-28811 — 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-2021-28811 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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