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CVE-2025-66172

Apache Cloudstack vulnerability

8.1 HIGHEPSS 0.51%
  1. Published8 May 2026

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 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected products

Apache Cloudstack≥ 4.21.0.0 < 4.22.0.1

Remediation

Fixed in
Apache Cloudstack≥ 4.22.0.1

References

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Frequently asked

Is CVE-2025-66172 being actively exploited?

CVE-2025-66172 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.51%.

How severe is CVE-2025-66172?

CVE-2025-66172 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.51% probability of exploitation.

Which products are affected by CVE-2025-66172?

Affected products include Apache Cloudstack.

How do I fix CVE-2025-66172?

Upgrade affected software to a fixed version, for example Apache Cloudstack 4.22.0.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-66172 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.