UpHeron
All vulnerabilities

Servers and applications

CVE-2021-25735

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.

Severity
Medium 6.5
Published
6 Sept 2021
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
1.18.18, 1.19.10, 1.20.6
Sources
NVD

Affected software

SoftwareAffected versions
KubernetesServers and applications · cpe:a:kubernetes:kubernetes
  • Every version before 1.18.18
  • From 1.19.0 before 1.19.10
  • From 1.20.0 before 1.20.6

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-25735
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-25735