CVE-2021-25735
Medium
Description
A security issue was discovered in kube-apiserver that could allow node updates to bypass a Validating Admission Webhook. Clusters are only affected by this vulnerability if they run a Validating Admission Webhook for Nodes that denies admission based at least partially on the old state of the Node object. Validating Admission Webhook does not observe some previous fields.
SeverityMedium
CVSS6.5
Exploit probability93. percentile5.4%
ProductKubernetes
PublishedSep 6, 2021
First seenSep 6, 2021
Weakness typeCWE-372CWE-372
How to fix
Update
- kubernetes kubernetes1.18.18, 1.19.10, 1.20.6 or later
- k8s.io/kubernetes1.20.6, 1.19.10, 1.18.18 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| kubernetes kubernetes | v < 1.18.18, 1.19.0 ≤ v < 1.19.10, 1.20.0 ≤ v < 1.20.6 | 1.18.18, 1.19.10, 1.20.6 |
| k8s.io/kubernetesGo | 1.20.0 ≤ v < 1.20.6, 1.19.0 ≤ v < 1.19.10, v < 1.18.18 | 1.20.6, 1.19.10, 1.18.18 |
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