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CVE-2021-25740: Confused Deputy in Kubernetes

September 21, 2021 (updated June 9, 2026)

A security issue was discovered with Kubernetes that could enable users to send network traffic to locations they would otherwise not have access to via a confused deputy attack.

References

  • github.com/advisories/GHSA-vw47-mr44-3jf9
  • github.com/kubernetes/kubernetes/issues/103675
  • groups.google.com/g/kubernetes-security-announce/c/WYE9ptrhSLE
  • kubernetes.io/blog/2026/05/26/reconciling-unfixed-kubernetes-cves
  • nvd.nist.gov/vuln/detail/CVE-2021-25740
  • security.netapp.com/advisory/ntap-20211014-0001

Code Behaviors & Features

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Affected versions

All versions up to 1.22.2

Solution

Unfortunately, there is no solution available yet.

Impact 3.1 LOW

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

Learn more about CVSS

Weakness

  • CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')
  • CWE-610: Externally Controlled Reference to a Resource in Another Sphere

Source file

go/k8s.io/kubernetes/CVE-2021-25740.yml

Spotted a mistake? Edit the file on GitLab.

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