CVE-2025-27489
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 · uneditedImproper input validation in Azure Local 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 confidenceThis is a local privilege escalation vulnerability in Azure Local stemming from improper input validation. An authorized attacker with basic system access can exploit insufficient input sanitization to elevate their privileges to higher levels on the local 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< 10.0.20348.3328< 10.0.25398.1486CVSS 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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Identify Azure Stack HCI versionRun 'Get-AzureStackHCI' in PowerShell or check the operating system version with 'winver' or 'systeminfo' on the Azure Local nodeAffected if The installed version is below 10.0.20348.3328 for 22h2 or below 10.0.25398.1486 for 23h2
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Confirm Azure Stack HCI release yearCheck if the environment is deployed as Azure Stack HCI 22h2 or 23h2 by reviewing the deployment documentation or checking the cluster name and version detailsAffected if The environment is running an older release channel that ships with vulnerable versions
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Verify local user access controlsReview which local users have basic system access on the Azure Local node using 'net user' or Active Directory Local Users and Groups managementAffected if There are unprivileged local users or groups that could be leveraged for privilege escalation (attacker requires basic system access per CVE description)
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Check for input validation loggingReview Windows Event Logs and any Azure Stack HCI diagnostic logs for suspicious command execution or input validation failuresAffected if Logs show anomalous commands or failed input validation attempts that may indicate exploitation attempts
A system is affected if it runs Azure Stack HCI 22h2 below version 10.0.20348.3328 or Azure Stack HCI 23h2 below version 10.0.25398.1486, and an attacker with basic local access exists.
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 · scoped10.0.20348.332810.0.25398.1486
Apply the Microsoft security update for CVE-2025-27489 to Azure Local installations; review and harden input validation routines in affected components per Microsoft guidance.
Azure Stack HCI 22h2: 10.0.20348.3328+ | Azure Stack HCI 23h2: 10.0.25398.1486+
- Check current Azure Stack HCI version by running 'Get-AzureStackHCI' in PowerShell or viewing in Azure Portal
- Identify which release (22h2 or 23h2) is currently installed
- For Azure Stack HCI 22h2: Upgrade to version 10.0.20348.3328 or later
- For Azure Stack HCI 23h2: Upgrade to version 10.0.25398.1486 or later
- Apply the update via Azure Update Manager or through the Azure Stack HCI admin center
- After upgrade, verify the version has been updated by re-running the version check
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-27489 — 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-2025-27489 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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- Version or environment caveats, and links to real fixes
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