CVE-2021-42311
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 · uneditedMicrosoft Defender for IoT Remote Code Execution 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 confidenceMicrosoft Defender for IoT contains a remote code execution vulnerability that allows unauthenticated attackers to execute arbitrary code on affected systems. The critical severity (CVSS 10) indicates complete system compromise is possible without user interaction.
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< 10.5.2CVSS 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
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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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Identify installed Defender for IoT versionUse the product's administrative console, management interface, or system information commands to retrieve the current software version. Common methods include checking the application's about page, using the product's CLI tool if available, or reviewing installed software listings.Affected if The installed version is lower than 10.5.2 (for example, 10.5.1, 10.4.x, or earlier)
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Verify management interface network exposureReview firewall rules and network configurations to determine whether the Defender for IoT management or API interfaces are accessible from untrusted or external networks. Check for open ports typically used by the product.Affected if The management interface is exposed to the internet or untrusted internal networks without proper access controls
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Confirm authentication settingsExamine the Defender for IoT configuration to verify whether authentication mechanisms are properly enforced and whether anonymous or guest access is enabled.Affected if Anonymous or unauthenticated access is permitted to product interfaces
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Check for recent security eventsReview Defender for IoT logs and security event records for suspicious authentication attempts, unusual API calls, or indicators of exploitation attempts targeting this vulnerability.Affected if Logs show unauthorized access attempts or exploitation indicators consistent with CVE-2021-42311
You are affected if Microsoft Defender for IoT is installed at a version below 10.5.2 and the product interfaces are network-accessible to 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.
dbcve · scoped10.5.2
Apply Microsoft security updates for Defender for IoT immediately. If patches are unavailable, consider network segmentation to limit exposure of the Defender for IoT components.
10.5.2 or later
- Upgrade Microsoft Defender for IoT to version 10.5.2 or later to remediate this SQL injection vulnerability
- Verify the upgrade was successful by checking the Defender for IoT version in the management console
- Confirm that the remote code execution vulnerability (CVE-2021-42311) is no longer present by reviewing the installed version
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 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 $2,560.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-42311 — 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-2021-42311 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