CVE-2021-32928
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 · uneditedThe Sentinel LDK Run-Time Environment installer (Versions 7.6 and prior) adds a firewall rule named “Sentinel License Manager” that allows incoming connections from private networks using TCP Port 1947. While uninstalling, the uninstaller fails to close Port 1947.
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 confidenceThe Sentinel LDK Run-Time Environment installer (versions 7.6 and prior) creates a Windows firewall rule named 'Sentinel License Manager' that allows incoming TCP connections on port 1947 from private networks. During uninstallation, the uninstaller fails to remove this firewall rule, leaving port 1947 exposed and potentially allowing unauthorized remote access to 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<= 7.6CVSS 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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Check for the Sentinel License Manager firewall ruleRun 'netsh advfirewall firewall show rule name=all' or use PowerShell Get-NetFirewallRule -DisplayName 'Sentinel License Manager' to list all firewall rules and look for a rule named 'Sentinel License Manager'Affected if A firewall rule named 'Sentinel License Manager' exists that allows incoming TCP connections on port 1947 from private networks
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Verify if port 1947 is listeningRun 'netstat -an | findstr :1947' or use PowerShell Get-NetTCPConnection -LocalPort 1947 to check if the system is listening on port 1947Affected if Port 1947 is in LISTENING state and accepting incoming TCP connections
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Check current Sentinel LDK installation statusCheck Windows Registry under HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall for Sentinel LDK entries, or run 'wmic product get name,version' to list installed softwareAffected if Sentinel LDK Run-Time Environment version 7.6 or prior is currently installed, or was previously uninstalled but the firewall rule persists
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Confirm the rule allows inbound traffic from private networksRun 'netsh advfirewall firewall show rule name="Sentinel License Manager"' and examine the LocalPort, Direction, and Profile settingsAffected if The rule shows Direction=In, Action=Allow, and Profile includes Private networks with LocalPort=1947
The environment is affected if the 'Sentinel License Manager' firewall rule exists allowing TCP port 1947 from private networks, regardless of whether Sentinel LDK is currently installed or was uninstalled, because the uninstaller fails to remove this rule.
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 dataAfter uninstalling Sentinel LDK Run-Time Environment, manually verify and remove the 'Sentinel License Manager' firewall rule and confirm port 1947 is no longer listening or exposed.
- Consultation1.0 h
- Implementation1.0 h
- Testing1.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-32928 — 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-2021-32928 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
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