CVE-2021-25736

CVE-2021-25736 · Windows kube-proxy LoadBalancer contention

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Kube-proxy on Windows can unintentionally forward traffic to local processes listening on the same port (“spec.ports[*].port”) as a LoadBalancer Service when the LoadBalancer controller does not set the “status.loadBalancer.ingress[].ip” field. Clusters where the LoadBalancer controller sets the “status.loadBalancer.ingress[].ip” field are unaffected.

CVSS 5.8 · Medium · EPSS 0.9%

Published: 2023-10-30T02:19:48.916Z
Updated: 2025-06-12T14:42:12.231Z

Stack: containers

Affected products and versions

kubernetes
Versions
- ≥ 0, ≤ v1.20.5: Affected (v1.20.5)
No fix published

Original sources

https://github.com/kubernetes/kubernetes/pull/99958
https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q/m/O15LOazPAgAJ
https://security.netapp.com/advisory/ntap-20231221-0003/
https://nvd.nist.gov/vuln/detail/CVE-2021-25736

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CVE-2021-25736 · Windows kube-proxy LoadBalancer contention

Affected products and versions

kubernetes

Original sources