CVE-2021-25735

    Dashboard / Vulnerabilities / CVE-2021-25735

    CVE-2021-25735

    Published: 6 Sept 2021Last Modified: 7 Aug 2026

    Summary:

    Details: 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.

    References: https://groups.google.com/g/kubernetes-security-announce/c/FKAGqT4jx9Y, https://github.com/kubernetes/kubernetes/issues/100096

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -91407aecd4edbe8888bb4648ee46e8dae792a20d

    Affected versions

    kubernetes-1.9.0-alpha.3
    kubernetes-1.9.0-alpha.2
    kubernetes-1.9.0-alpha.1
    kubernetes-1.9.0-alpha.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-25735 | CVE-DB