CVE-2021-25735GHSA-G42G-737J-QX6JGO-2022-0907
Validating Admission Webhook does not observe some previous fields
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 1.20.6, 1.19.10, 1.18.18
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- 1 proof of concept on GitHub
Summary
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.
Timeline
- CVE published
- Record last updated
Affected versions
- Kubernetes Kubernetes
through 1.18.17; through 1.19.9; through 1.20.5
- k8s.io/kubernetesGo
From 1.20.0 · fixed in 1.20.6
- k8s.io/kubernetesGo
From 1.19.0 · fixed in 1.19.10
- k8s.io/kubernetesGo
fixed in 1.18.18
- k8s.io/kubernetesGo
fixed in 1.18.18; From 1.19.0 · fixed in 1.19.10; From 1.20.0 · fixed in 1.20.6