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CloudstackApplication · Apache

CVE-2025-66172

HIGH · 8.1 CVSS v3.1 Published 2026-05-08
Fix available
A fix is available. Upgrade to 4.22.0.1 or later.
See remediation →
87/100
Remediation priority · High
Remotely reachable Zero-click

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 · unedited
The CloudStack Backup plugin has an improper access logic in versions 4.21.0.0 and 4.22.0.0. Anyone with authenticated user-account access in CloudStack 4.21.0.0+ environments, where this plugin is enabled and have access to specific APIs can restore a volume from any other user's backups and attach the volume to their own VMs. Backup plugin users using CloudStack 4.21.0.0+ are recommended to upgrade to CloudStack version 4.22.0.1, which fixes this issue.

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 · high confidence

The CloudStack Backup plugin in versions 4.21.0.0 and 4.22.0.0 has an improper access control flaw that allows any authenticated user with access to specific APIs to restore volumes from any other user's backups and attach them to their own VMs, enabling unauthorized cross-user data access.

MitigationUpgrade to CloudStack version 4.22.0.1 which contains the fix for this improper access control vulnerability.

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
CloudstackApplication
Affected:>= 4.21.0.0, < 4.22.0.1

CVSS 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
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify the CloudStack management server version
    Query the CloudStack API using the listCapabilities command, or check the management server package version via your system's package manager, or inspect the management server startup logs for the version string
    Affected if The installed version is 4.21.0.0 through 4.22.0.0 (inclusive), meaning it falls within the range >= 4.21.0.0 and < 4.22.0.1
  2. Confirm the Backup and Recovery feature is enabled
    Check the CloudStack configuration settings or API listResourceDetails for the backup plugin to verify it is active in your environment
    Affected if The backup and recovery feature is enabled and users have access to backup-related APIs
  3. Verify user access to the restore volume API
    Review the API whitelist and user role permissions, specifically examining whether non-admin users have access to restoreVolume or similar backup restoration APIs
    Affected if Regular (non-admin) users have permissions to invoke volume restore APIs through the Backup plugin

You are affected if your CloudStack version is 4.21.0.0 through 4.22.0.0 and the Backup plugin is enabled, allowing authenticated users to access restore APIs.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Upgrade available Upgrade to 4.22.0.1 or later
Fixed in 4.22.0.1
Interim mitigation

Upgrade to CloudStack version 4.22.0.1 which contains the fix for this improper access control vulnerability.

Recommended fix High confidence

4.22.0.1

  1. 1. Identify all CloudStack installations running versions 4.21.0.0 through 4.22.0.0 that have the Backup plugin enabled.
  2. 2. Schedule a maintenance window for the upgrade operation.
  3. 3. Back up the CloudStack database and configuration files before proceeding.
  4. 4. Upgrade the CloudStack management server(s) to version 4.22.0.1 by following the official upgrade documentation.
  5. 5. Restart all CloudStack services on the management server(s).
  6. 6. Verify that the upgrade completed successfully by checking the CloudStack version in the UI or API.
  7. 7. Test that the Backup plugin functionality works correctly after the upgrade.
  8. 8. Confirm that users can no longer restore volumes from other users' backups (the access control should now be properly enforced).

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Cloudstack Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA3.0 h
21.0 hours of engineering $3,680
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-66172 in production — separate from our analysis above.

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What this is

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What belongs here
  • 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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