CVE-2021-25735

moderate-risk
Published 2021-09-06

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.

Do I need to act?

!
14.4% chance of exploitation in next 30 days
EPSS score — higher than 86% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.5/10 Medium
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Kubernetes

References (4)

Patch https://github.com/kubernetes/kubernetes/issues/100096
Mailing List https://groups.google.com/g/kubernetes-security-announce/c/FKAGqT4jx9Y
Patch https://github.com/kubernetes/kubernetes/issues/100096
Mailing List https://groups.google.com/g/kubernetes-security-announce/c/FKAGqT4jx9Y
41
/ 100
moderate-risk
Severity 24/34 · High
Exploitability 12/34 · Low
Exposure 5/34 · Minimal