Low severity3.1NVD Advisory· Published Sep 20, 2021· Updated Jun 1, 2026
CVE-2021-25740
CVE-2021-25740
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.
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
166cpe:2.3:a:kubernetes:kubernetes:-:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:kubernetes:kubernetes:-:*:*:*:*:*:*:*
- (no CPE)range: unspecified
- osv-coords164 versionspkg:apk/chainguard/kubeadm-1.28pkg:apk/chainguard/kubeadm-1.28-defaultpkg:apk/chainguard/kubeadm-1.29pkg:apk/chainguard/kubeadm-1.29-defaultpkg:apk/chainguard/kubeadm-1.30pkg:apk/chainguard/kubeadm-1.30-defaultpkg:apk/chainguard/kubeadm-1.31pkg:apk/chainguard/kubeadm-1.31-defaultpkg:apk/chainguard/kubeadm-1.32pkg:apk/chainguard/kubeadm-1.32-defaultpkg:apk/chainguard/kube-apiserver-1.28pkg:apk/chainguard/kube-apiserver-1.28-defaultpkg:apk/chainguard/kube-apiserver-1.29pkg:apk/chainguard/kube-apiserver-1.29-defaultpkg:apk/chainguard/kube-apiserver-1.30pkg:apk/chainguard/kube-apiserver-1.30-defaultpkg:apk/chainguard/kube-apiserver-1.31pkg:apk/chainguard/kube-apiserver-1.31-defaultpkg:apk/chainguard/kube-apiserver-1.32pkg:apk/chainguard/kube-apiserver-1.32-defaultpkg:apk/chainguard/kube-controller-manager-1.28pkg:apk/chainguard/kube-controller-manager-1.28-defaultpkg:apk/chainguard/kube-controller-manager-1.29pkg:apk/chainguard/kube-controller-manager-1.29-defaultpkg:apk/chainguard/kube-controller-manager-1.30pkg:apk/chainguard/kube-controller-manager-1.30-defaultpkg:apk/chainguard/kube-controller-manager-1.31pkg:apk/chainguard/kube-controller-manager-1.31-defaultpkg:apk/chainguard/kube-controller-manager-1.32pkg:apk/chainguard/kube-controller-manager-1.32-defaultpkg:apk/chainguard/kubectl-1.28pkg:apk/chainguard/kubectl-1.28-bitnami-compatpkg:apk/chainguard/kubectl-1.28-defaultpkg:apk/chainguard/kubectl-1.29pkg:apk/chainguard/kubectl-1.29-bitnami-compatpkg:apk/chainguard/kubectl-1.29-defaultpkg:apk/chainguard/kubectl-1.30pkg:apk/chainguard/kubectl-1.30-bitnami-compatpkg:apk/chainguard/kubectl-1.30-defaultpkg:apk/chainguard/kubectl-1.31pkg:apk/chainguard/kubectl-1.31-bitnami-compatpkg:apk/chainguard/kubectl-1.31-defaultpkg:apk/chainguard/kubectl-1.32pkg:apk/chainguard/kubectl-1.32-bitnami-compatpkg:apk/chainguard/kubectl-1.32-defaultpkg:apk/chainguard/kubectl-bash-completion-1.28pkg:apk/chainguard/kubectl-bash-completion-1.29pkg:apk/chainguard/kubectl-bash-completion-1.30pkg:apk/chainguard/kubectl-bash-completion-1.31pkg:apk/chainguard/kubectl-bash-completion-1.32pkg: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/kubelet-1.28pkg:apk/chainguard/kubelet-1.28-defaultpkg:apk/chainguard/kubelet-1.29pkg:apk/chainguard/kubelet-1.29-defaultpkg:apk/chainguard/kubelet-1.30pkg:apk/chainguard/kubelet-1.30-defaultpkg:apk/chainguard/kubelet-1.31pkg:apk/chainguard/kubelet-1.31-defaultpkg:apk/chainguard/kubelet-1.32pkg:apk/chainguard/kubelet-1.32-defaultpkg:apk/chainguard/kube-proxy-1.28pkg:apk/chainguard/kube-proxy-1.28-defaultpkg:apk/chainguard/kube-proxy-1.28-default-compatpkg:apk/chainguard/kube-proxy-1.29pkg:apk/chainguard/kube-proxy-1.29-defaultpkg:apk/chainguard/kube-proxy-1.29-default-compatpkg:apk/chainguard/kube-proxy-1.30pkg:apk/chainguard/kube-proxy-1.30-defaultpkg:apk/chainguard/kube-proxy-1.30-default-compatpkg:apk/chainguard/kube-proxy-1.31pkg:apk/chainguard/kube-proxy-1.31-defaultpkg:apk/chainguard/kube-proxy-1.31-default-compatpkg:apk/chainguard/kube-proxy-1.32pkg:apk/chainguard/kube-proxy-1.32-defaultpkg:apk/chainguard/kube-proxy-1.32-default-compatpkg:apk/chainguard/kubernetes-1.28pkg:apk/chainguard/kubernetes-1.28-defaultpkg:apk/chainguard/kubernetes-1.29pkg:apk/chainguard/kubernetes-1.29-defaultpkg:apk/chainguard/kubernetes-1.30pkg:apk/chainguard/kubernetes-1.30-defaultpkg:apk/chainguard/kubernetes-1.31pkg:apk/chainguard/kubernetes-1.31-defaultpkg:apk/chainguard/kubernetes-1.32pkg:apk/chainguard/kubernetes-1.32-defaultpkg:apk/chainguard/kubernetes-dns-node-cache-1.17pkg:apk/chainguard/kubernetes-pause-1.28pkg:apk/chainguard/kubernetes-pause-1.29pkg:apk/chainguard/kubernetes-pause-1.30pkg:apk/chainguard/kubernetes-pause-1.31pkg:apk/chainguard/kubernetes-pause-1.32pkg:apk/chainguard/kubernetes-pause-compat-1.28pkg:apk/chainguard/kubernetes-pause-compat-1.29pkg:apk/chainguard/kubernetes-pause-compat-1.30pkg:apk/chainguard/kubernetes-pause-compat-1.31pkg:apk/chainguard/kubernetes-pause-compat-1.32pkg:apk/chainguard/kube-scheduler-1.28pkg:apk/chainguard/kube-scheduler-1.28-defaultpkg:apk/chainguard/kube-scheduler-1.29pkg:apk/chainguard/kube-scheduler-1.29-defaultpkg:apk/chainguard/kube-scheduler-1.30pkg:apk/chainguard/kube-scheduler-1.30-defaultpkg:apk/chainguard/kube-scheduler-1.31pkg:apk/chainguard/kube-scheduler-1.31-defaultpkg:apk/chainguard/kube-scheduler-1.32pkg:apk/chainguard/kube-scheduler-1.32-defaultpkg:apk/chainguard/nodetaintpkg:apk/chainguard/sparkctlpkg:apk/chainguard/spark-operatorpkg:apk/chainguard/spark-operator-oci-entrypointpkg:apk/wolfi/kubeadm-1.32pkg:apk/wolfi/kubeadm-1.32-defaultpkg:apk/wolfi/kube-apiserver-1.32pkg:apk/wolfi/kube-apiserver-1.32-defaultpkg:apk/wolfi/kube-controller-manager-1.32pkg:apk/wolfi/kube-controller-manager-1.32-defaultpkg:apk/wolfi/kubectl-1.32pkg:apk/wolfi/kubectl-1.32-bitnami-compatpkg:apk/wolfi/kubectl-1.32-defaultpkg:apk/wolfi/kubectl-bash-completion-1.32pkg: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/kubelet-1.32pkg:apk/wolfi/kubelet-1.32-defaultpkg:apk/wolfi/kube-proxy-1.32pkg:apk/wolfi/kube-proxy-1.32-defaultpkg:apk/wolfi/kube-proxy-1.32-default-compatpkg:apk/wolfi/kubernetes-1.28pkg:apk/wolfi/kubernetes-1.29pkg:apk/wolfi/kubernetes-1.30pkg:apk/wolfi/kubernetes-1.31pkg:apk/wolfi/kubernetes-1.32pkg:apk/wolfi/kubernetes-1.32-defaultpkg:apk/wolfi/kubernetes-pause-1.32pkg:apk/wolfi/kubernetes-pause-compat-1.32pkg:apk/wolfi/kube-scheduler-1.32pkg:apk/wolfi/kube-scheduler-1.32-defaultpkg:apk/wolfi/nodetaintpkg:apk/wolfi/sparkctlpkg:apk/wolfi/spark-operatorpkg:apk/wolfi/spark-operator-oci-entrypointpkg:golang/k8s.io/kubernetes
< 0+ 163 more
- (no CPE)range: < 0
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- (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-vw47-mr44-3jf9ghsaADVISORY
- github.com/kubernetes/kubernetes/issues/103675nvdMitigationThird Party AdvisoryWEB
- groups.google.com/g/kubernetes-security-announce/c/WYE9ptrhSLEnvdMailing ListMitigationThird Party AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2021-25740ghsaADVISORY
- security.netapp.com/advisory/ntap-20211014-0001/nvdThird Party Advisory
- kubernetes.io/blog/2026/05/26/reconciling-unfixed-kubernetes-cvesghsaWEB
- security.netapp.com/advisory/ntap-20211014-0001ghsaWEB
- kubernetes.io/blog/2026/05/26/reconciling-unfixed-kubernetes-cves/nvd
News mentions
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