CVE-2021-25740

Holes in EndpointSlice Validation Enable Host Network Hijack

State: Published
Severity: 3.1 Low
Published: Sep 20, 2021
Updated: Jun 1, 2026
Reserved: Jan 21, 2021

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	3.1 Low	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N	kubernetes

Weaknesses

CWE-441 Unintended Proxy or Intermediary

Affected Products

Product	Versions
KubernetesKubernetes	all versionsAffected

References

https://kubernetes.io/blog/2026/05/26/reconciling-unfixed-kubernetes-cves/
https://groups.google.com/g/kubernetes-security-announce/c/WYE9ptrhSLE
https://github.com/kubernetes/kubernetes/issues/103675
https://security.netapp.com/advisory/ntap-20211014-0001/

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