CVE-2021-25737

MediumCVSS 4.8/10Last modified Jun 17, 2026

Description

A security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.

Metrics

CVSS 3.1 4.8/10CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-184 CWE-601

Affected software

Vendor	Product	Versions
Kubernetes	Kubernetes	>= unspecified, <= 1.18.18; >= unspecified, <= 1.19.10; >= unspecified, <= 1.20.6; >= unspecified, <= 1.21.0

References

https://github.com/kubernetes/kubernetes/issues/102106Patch, Third Party Advisory
https://groups.google.com/g/kubernetes-security-announce/c/xAiN3924thYMailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20211004-0004/Third Party Advisory
https://github.com/kubernetes/kubernetes/issues/102106Patch, Third Party Advisory
https://groups.google.com/g/kubernetes-security-announce/c/xAiN3924thYMailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20211004-0004/Third Party Advisory

Timeline

Published: Sep 6, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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