CVE-2021-34691
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 · uneditediDrive RemotePC before 4.0.1 on Linux allows denial of service. A remote and unauthenticated attacker can disconnect a valid user session by connecting to an ephemeral port.
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 confidenceiDrive RemotePC versions before 4.0.1 on Linux contain a denial of service vulnerability where a remote, unauthenticated attacker can disconnect active user sessions by simply connecting to an ephemeral port on the target 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< 4.0.1CVSS 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
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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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Check if iDrive RemotePC is installedLook for RemotePC installation directories or files. Common locations include /opt/RemotePC, /usr/local/RemotePC, or check for the 'RemotePC' process running via 'ps aux | grep -i remotepc'Affected if RemotePC is not found on the system, so the vulnerability does not apply
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Determine the installed versionCheck the RemotePC version by examining the application binary, package info, or running the version command if available. Common locations: /opt/RemotePC/RemotePC --version, or check /opt/RemotePC/version.txtAffected if The installed version is below 4.0.1 (any version starting with a number less than 4, or version 4.0.0 or lower)
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Verify the RemotePC service is runningCheck if the RemotePC daemon or service is active by running 'ps aux | grep -i RemotePC' or 'systemctl status RemotePC'Affected if The RemotePC service is actively running on the system, making it exposed to network-based attacks
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Check network exposureDetermine if the RemotePC service ports are accessible from the network. Use 'netstat -tlnp | grep -E "(RemotePC|5000|5900)"' or 'ss -tlnp' to see which ports the service is listening on and whether they are bound to external interfacesAffected if The service is listening on externally accessible network interfaces (not bound to localhost only)
You are affected if iDrive RemotePC version 4.0.1 or later is NOT installed AND the RemotePC service is actively running and network-accessible.
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 data4.0.1
Upgrade iDrive RemotePC for Linux to version 4.0.1 or later to remediate this vulnerability.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,272.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-34691 — 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-2021-34691 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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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
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