CVE-2020-8569Public exploitNetwork attack vector

Snapshot-service interruption via nil snapshot dereference

Published Jan 21, 2021 · Updated Sep 17, 2024

Denial of service in Kubernetes CSI Snapshotter 2.1.0 through 2.1.2 and 3.0.0 through 3.0.1 allows remote authenticated users to stop snapshots. checkAndUpdateSnapshotClass returns nil after SetDefaultSnapshotClass fails on a missing PVC, and syncSnapshotByKey dereferences that nil snapshot. Exploitation requires permission to create classless VolumeSnapshot objects referencing nonexistent PVCs; repeated reconciliation keeps the controller in a crashloop while other Kubernetes functions remain available.

CVSS severity4.3
Medium
EPSS probability2.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Kubernetes CSI Snapshotter 2.1.0 through 2.1.2 and 3.0.0 through 3.0.1 allows remote authenticated users to stop snapshots. checkAndUpdateSnapshotClass returns nil after SetDefaultSnapshotClass fails on a missing PVC, and syncSnapshotByKey dereferences that nil snapshot. Exploitation requires permission to create classless VolumeSnapshot objects referencing nonexistent PVCs; repeated reconciliation keeps the controller in a crashloop while other Kubernetes functions remain available.

The record

CVE
CVE-2020-8569
Published
Jan 21, 2021
Updated
Sep 17, 2024
Vendor
Kubernetes
Product
CSI Snapshotter
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 21, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=snapshot-controller v2.1 <=v2.1.2
  2. Affected versionversion=snapshot-controller v3.0 <=v3.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Kubernetes · CSI Snapshotterversion=snapshot-controller v2.1 <=v2.1.2; version=snapshot-controller v3.0 <=v3.0.1

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.3KubernetesCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
4.0NIST NVDAV:N/AC:L/Au:S/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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