CVE-2021-1686
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 · uneditedWindows WalletService Elevation of Privilege Vulnerability
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 confidenceWindows WalletService contains an elevation of privilege vulnerability that allows a local attacker to gain higher-level system privileges. The WalletService runs with elevated privileges and improper validation in the service allows a local authenticated attacker to execute arbitrary code with elevated permissions.
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 dataall versions= 20h2= 1607= 1803= 1809= 1909= 2004CVSS 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
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/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 WalletService exists on the systemOpen Command Prompt or PowerShell and run: Get-Service -Name WalletService -ErrorAction SilentlyContinue | Select-Object Name, StatusAffected if The service returns no results (Service not found) indicates the service is not present on this system
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Check if WalletService is runningIf the service exists, run: (Get-Service -Name WalletService).StatusAffected if Status shows 'Running' - the vulnerable service is active; if 'Stopped' or not found, the attack surface may not be present
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Confirm Windows version is affectedRun: winver or in PowerShell: [System.Environment]::OSVersion.VersionAffected if Version matches Windows 10 versions 1607, 1803, 1809, 1909, 2004, or 20H2 - these are in the affected range
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Verify local authentication contextRun: whoami to confirm current user contextAffected if Any local authenticated user account (standard user or administrator) can potentially exploit this vulnerability if WalletService is running on an affected Windows version
A system is affected if it runs Windows 10 versions 1607, 1803, 1809, 1909, 2004, or 20H2 AND has the WalletService installed and running, allowing any local authenticated user to potentially elevate privileges.
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 dataApply the Microsoft security update for CVE-2021-1686 via Windows Update or Microsoft Security Update Guide. Prioritize patching systems with local user access.
- Consultation2.0 h
- Implementation1.0 h
- Testing3.0 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 $2,224.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-1686 — 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-2021-1686 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
- No spam, self-promotion, credentials, or personal data