Vulnerability Description
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 create new VMs using backups of any other user of the environment. Backup plugin users using CloudStack 4.21.0.0+ are recommended to upgrade to CloudStack version 4.22.0.1, which fixes this issue.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Cloudstack | >= 4.21.0.0, < 4.22.0.1 |
Related Weaknesses (CWE)
References
- https://lists.apache.org/thread/n8mt5b7wkpysstb8w7rr9f02kc5cq2xmMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2026/05/09/2Mailing ListThird Party Advisory
FAQ
What is CVE-2025-66171?
CVE-2025-66171 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 en...
How severe is CVE-2025-66171?
CVE-2025-66171 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-66171?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Cloudstack.