CVE-2025-21416
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 · uneditedMissing authorization in Azure Virtual Desktop allows an authorized attacker to elevate privileges over a network.
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 an authorization bypass vulnerability in Azure Virtual Desktop where the service fails to properly validate authorization checks, allowing an authenticated attacker to elevate their privileges beyond what their account should permit. The attack is network-based and achievable by someone with valid credentials.
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 versionsCVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/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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Confirm Azure Virtual Desktop deploymentRun 'Get-AzResourceGroup' or check Azure Portal for resources of type 'Microsoft.DesktopVirtualization' host pools, workspace, or application groupsAffected if Any Azure Virtual Desktop resources exist in the subscription
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List all RBAC role assignments in AVD resource scopesUse Azure Portal, Azure CLI ('az role assignment list --scope /subscriptions/.../Microsoft.DesktopVirtualization'), or PowerShell ('Get-AzRoleAssignment -Scope ...') for host pools, workspaces, and application groupsAffected if Any authenticated users have role assignments at these scopes - the vulnerability allows privilege elevation beyond what the assigned role should permit
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Review role assignments for over-privileged accountsCompare each user's assigned roles against their expected permissions. Check for assignments that grant more permissions than the user's job function requires, especially on AVD host pools and workspacesAffected if Users have roles that exceed what they should legitimately have based on their assigned role definition
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Check for unexpected role assignment changesReview Azure Activity Log for 'Microsoft.Authorization/roleAssignments' write operations within Microsoft.DesktopVirtualization namespace, focusing on who granted new roles and to whomAffected if There are recent role assignment creations or modifications that cannot be attributed to authorized administrators
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Audit AVD user session permissionsIn Azure Portal, navigate to each AVD host pool and review 'User Sessions' or use 'Get-RdsSessionHost' to inspect connected users and their effective permissionsAffected if Users appear to be accessing resources or performing actions that their assigned RBAC role should not permit
If Azure Virtual Desktop is deployed and users have RBAC role assignments at AVD scopes, they are potentially affected by this authorization bypass that allows privilege elevation beyond the intended role permissions.
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 dataMonitor Microsoft Security Response Center for the patch and apply Azure Virtual Desktop updates promptly; review role-based access control (RBAC) assignments and audit privileged user accounts in the Azure environment.
- Consultation4.0 h
- Implementation2.0 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 $3,152.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-21416 — 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-2025-21416 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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