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CVE-2025-66467: Missing MinIO policy cleanup on bucket deletion via Apache CloudStack allows users to retain access to buckets

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HIGH 8.0WATCHLISTUPGRADE

CVE-2025-66467 is a high-severity flaw (CVSS 8.0) affecting cloudstack. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Missing MinIO policy cleanup on bucket deletion via Apache CloudStack allows users to retain access to buckets which they previously owned. If another user creates a new bucket with the same name, the previous owners can gain unauthorized read and write access to it by using the previously generated access and secret keys. Users are recommended to upgrade to Apache CloudStack versions 4.20.3.0 or 4.22.0.1, or later, which fixes this issue.

Why this priority

  • High severity
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score8.0 (High)
Attack vectorNetwork (remote)
Attack complexityHigh
Privileges neededLow
User interactionRequired
EPSS exploit chance0.4% (top 69%)
CISA exploited listNo
WeaknessCWE-459
Published2026-05-08
Last modified2026-10-07
Publisher (CNA): Apache Software Foundation · Vendor: apache

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Last updated 2026-10-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

apache cloudstack UPGRADE
Affected: >= 4.19.0.0 and < 4.20.3.0 · >= 4.21.0.0 and < 4.22.0.1
Fixed in: 4.20.3.0, 4.22.0.1
Safe to downgrade to: a release before 4.19.0.0
1. Check installed version
apt-cache policy cloudstack || rpm -q cloudstack || cloudstack --version
2. UPGRADE to 4.20.3.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade cloudstack
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade cloudstack
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 4.19.0.0 (Debian / Ubuntu)
apt-cache madison cloudstack sudo apt install cloudstack=<VERSION_BEFORE_4.19.0.0> sudo apt-mark hold cloudstack
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list cloudstack sudo dnf downgrade cloudstack-<VERSION_BEFORE_4.19.0.0> sudo dnf versionlock add cloudstack
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-66467?

cloudstack: upgrade to 4.20.3.0, 4.22.0.1. Exact commands for each OS are on this page.

Is CVE-2025-66467 being exploited?

CVE-2025-66467 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-66467 affect?

CVE-2025-66467 affects cloudstack. Severity is high (CVSS 8.0). Missing MinIO policy cleanup on bucket deletion via Apache CloudStack allows users to retain access to buckets which they previously owned. If another user creates a new bucket with the same name, the previous owners can gain unauthorized r

How urgent is CVE-2025-66467?

Priority 41/100. High severity; On your watchlist

Software pages

MinIO vulnerabilities

Related CVEs

References

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