CVE-2026-21224
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 · uneditedStack-based buffer overflow in Azure Connected Machine Agent allows an authorized attacker to elevate privileges locally.
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 confidenceA stack-based buffer overflow vulnerability exists in Azure Connected Machine Agent that enables a locally authorized attacker to escalate privileges by overflowing a stack-allocated buffer, potentially executing 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 data< 1.60CVSS 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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Locate the Azure Connected Machine Agent installationOn Windows: Check for the service named 'Azure Connected Machine Agent' via Get-Service or look for C:\Program Files\AzureConnectedMachineAgent\azcmagent.exe. On Linux: check for /usr/bin/azcmagent or the azcmagent package.Affected if The agent is not installed on the system.
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Retrieve the installed version numberRun 'azcmagent --version' from the installation directory, or on Windows check the file version of azcmagent.exe. On Linux, run 'dpkg -l azure-connected-machine-agent' or 'rpm -qi azure-connected-machine-agent'.Affected if Unable to determine the version from the installed agent.
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Compare version to the affected rangeVerify if the installed version is below 1.60. Note that version 1.60 and later are not affected.Affected if The installed version is less than 1.60 (e.g., 1.55, 1.58, etc.).
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Confirm the agent service is runningOn Windows: Run Get-Service -Name 'Azure Connected Machine Agent' or check via services.msc. On Linux: Run 'systemctl status azcmagent' or 'ps aux | grep azcmagent'.Affected if The service is running with a version below 1.60.
The system is affected if Azure Connected Machine Agent is installed, running, and the version is below 1.60.
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 · scoped1.60
Apply the vendor-supplied patch or update Azure Connected Machine Agent to the latest version that addresses the stack-based buffer overflow vulnerability.
Azure Connected Machine Agent version 1.60 or later
- Identify the currently installed version of Azure Connected Machine Agent
- Download Azure Connected Machine Agent version 1.60 or later from the official Microsoft download center
- Stop any running Azure Connected Machine Agent services
- Upgrade the agent to version 1.60 or later using the appropriate installation method for your environment
- Verify the installed version is 1.60 or higher
- Restart the Azure Connected Machine Agent services
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-21224 — 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-2026-21224 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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