CVE-2020-8562Network attack vector

Private-network access via DNS resolution race

Published Feb 1, 2022 · Updated Jun 1, 2026

DNS race in the Kubernetes API Server allows remote authenticated users to access private control-plane networks through proxy requests. The proxy rejects a forbidden first DNS answer, then resolves the same name again without validating the address used for the connection. Exploitation requires different uncached DNS answers and permission either to modify and proxy to Node objects or to modify StorageClass objects and read controller-manager logs.

CVSS severity3.1
Low
EPSS probability1.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DNS race in the Kubernetes API Server allows remote authenticated users to access private control-plane networks through proxy requests. The proxy rejects a forbidden first DNS answer, then resolves the same name again without validating the address used for the connection. Exploitation requires different uncached DNS answers and permission either to modify and proxy to Node objects or to modify StorageClass objects and read controller-manager logs.

The record

CVE
CVE-2020-8562
Published
Feb 1, 2022
Updated
Jun 1, 2026
Vendor
Kubernetes
Product
Kubernetes
Classifications
CWE-367, T1090
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 1, 2022CVE publishedPublication date reported by the CVE source.
  2. Jun 1, 2026Record 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=0 <*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Kubernetes · Kubernetesversion=0 <*

Published CVSS scores

3.1KubernetesCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1090Proxy

Public exploit references

No public exploit references are available in this record.

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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