Moderate severityNVD Advisory· Published Oct 30, 2023· Updated Jun 12, 2025
Windows kube-proxy LoadBalancer contention
CVE-2021-25736
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
k8s.io/kubernetesGo | < 1.21 | 1.21 |
Affected products
36- osv-coords35 versionspkg:apk/chainguard/kubeflow-pipelinespkg:apk/chainguard/kubeflow-pipelines-apiserverpkg:apk/chainguard/kubeflow-pipelines-cache-deployerpkg:apk/chainguard/kubeflow-pipelines-cache-deployer-compatpkg:apk/chainguard/kubeflow-pipelines-cache_serverpkg:apk/chainguard/kubeflow-pipelines-frontendpkg:apk/chainguard/kubeflow-pipelines-metadata-envoy-configpkg:apk/chainguard/kubeflow-pipelines-metadata-writerpkg:apk/chainguard/kubeflow-pipelines-metadata-writer-compatpkg:apk/chainguard/kubeflow-pipelines-persistence_agentpkg:apk/chainguard/kubeflow-pipelines-scheduledworkflowpkg:apk/chainguard/kubeflow-pipelines-viewer-crd-controllerpkg:apk/chainguard/kubernetes-dns-node-cache-1.17pkg:apk/chainguard/nodetaintpkg:apk/chainguard/sparkctlpkg:apk/chainguard/spark-operatorpkg:apk/chainguard/spark-operator-oci-entrypointpkg:apk/wolfi/kubeflow-pipelinespkg:apk/wolfi/kubeflow-pipelines-apiserverpkg:apk/wolfi/kubeflow-pipelines-cache-deployerpkg:apk/wolfi/kubeflow-pipelines-cache-deployer-compatpkg:apk/wolfi/kubeflow-pipelines-cache_serverpkg:apk/wolfi/kubeflow-pipelines-frontendpkg:apk/wolfi/kubeflow-pipelines-metadata-envoy-configpkg:apk/wolfi/kubeflow-pipelines-metadata-writerpkg:apk/wolfi/kubeflow-pipelines-metadata-writer-compatpkg:apk/wolfi/kubeflow-pipelines-persistence_agentpkg:apk/wolfi/kubeflow-pipelines-scheduledworkflowpkg:apk/wolfi/kubeflow-pipelines-viewer-crd-controllerpkg:apk/wolfi/nodetaintpkg:apk/wolfi/sparkctlpkg:apk/wolfi/spark-operatorpkg:apk/wolfi/spark-operator-oci-entrypointpkg:golang/k8s.io/kubernetespkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Tumbleweed
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- Range: 0
Patches
Vulnerability mechanics
References
7- github.com/advisories/GHSA-35c7-w35f-xwghghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2021-25736ghsaADVISORY
- github.com/kubernetes/kubernetes/commit/b014610de3e5cf1bb0f7844b5758d29fc18b75e6ghsaWEB
- github.com/kubernetes/kubernetes/pull/99958ghsaWEB
- groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q/m/O15LOazPAgAJghsaWEB
- security.netapp.com/advisory/ntap-20231221-0003ghsaWEB
- security.netapp.com/advisory/ntap-20231221-0003/mitre
News mentions
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