What’s Vulnerable › Vulnerabilities

CVE-2020-8569: Kubernetes CSI snapshot-controller DoS

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-01-21 · updated 2026-06-17
• Weakness: CWE-476

Description

Kubernetes CSI snapshot-controller prior to v2.1.3 and v3.0.2 could panic when processing a VolumeSnapshot custom resource when: - The VolumeSnapshot referenced a non-existing PersistentVolumeClaim and the VolumeSnapshot did not reference any VolumeSnapshotClass. - The snapshot-controller crashes, is automatically restarted by Kubernetes, and processes the same VolumeSnapshot custom resource after the restart, entering an endless crashloop. Only the volume snapshot feature is affected by this vulnerability. When exploited, users can’t take snapshots of their volumes or delete the snapshots. All other Kubernetes functionality is not affected.

Affected products

• Kubernetes CSI Snapshotter: from 2.1.0 before 2.1.3; from 3.0.0 before 3.0.2 — fixed in 2.1.3, 3.0.2

How to fix

Upgrade to a fixed version: Kubernetes CSI Snapshotter 2.1.3, 3.0.2. Check the vendor advisory for mitigations.

References

• https://github.com/kubernetes-csi/external-snapshotter/issues/380
• https://groups.google.com/g/kubernetes-security-announce/c/1EzCr1qUxxU
• https://github.com/kubernetes-csi/external-snapshotter/issues/380
• https://groups.google.com/g/kubernetes-security-announce/c/1EzCr1qUxxU

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