Medium severity4.1NVD Advisory· Published Sep 20, 2021· Updated Jun 1, 2026
CVE-2020-8561
CVE-2020-8561
Description
A security issue was discovered in Kubernetes where actors that control the responses of MutatingWebhookConfiguration or ValidatingWebhookConfiguration requests are able to redirect kube-apiserver requests to private networks of the apiserver. If that user can view kube-apiserver logs when the log level is set to 10, they can view the redirected responses and headers in the logs.
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 | <= 1.22.2 | — |
Affected products
38cpe:2.3:a:kubernetes:kubernetes:1.20.11:-:*:*:*:*:*:*+ 3 more
- cpe:2.3:a:kubernetes:kubernetes:1.20.11:-:*:*:*:*:*:*
- cpe:2.3:a:kubernetes:kubernetes:1.21.5:-:*:*:*:*:*:*
- cpe:2.3:a:kubernetes:kubernetes:1.22.2:-:*:*:*:*:*:*
- (no CPE)range: unspecified
- osv-coords34 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/kubernetes
< 0+ 33 more
- (no CPE)range: < 0
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- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
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- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: <= 1.22.2
Patches
Vulnerability mechanics
References
8- github.com/advisories/GHSA-74j8-88mm-7496ghsaADVISORY
- github.com/kubernetes/kubernetes/issues/104720nvdMitigationThird Party AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2020-8561ghsaADVISORY
- security.netapp.com/advisory/ntap-20211014-0002/nvdThird Party Advisory
- groups.google.com/g/kubernetes-security-announce/c/RV2IhwcrQsYnvdMailing ListMitigationWEB
- kubernetes.io/blog/2026/05/26/reconciling-unfixed-kubernetes-cvesghsaWEB
- security.netapp.com/advisory/ntap-20211014-0002ghsaWEB
- kubernetes.io/blog/2026/05/26/reconciling-unfixed-kubernetes-cves/nvd
News mentions
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