Vulnerability Details : 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.
Published 2021-09-06 12:15:08
Updated 2023-06-26 19:16:31
Source Kubernetes
View at NVD,   CVE.org

Products affected by CVE-2021-25735

Exploit prediction scoring system (EPSS) score for CVE-2021-25735

EPSS FAQ
0.07%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 28 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-25735

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
5.5
 MEDIUM AV:N/AC:L/Au:S/C:N/I:P/A:P
8.0
4.9
 NIST
6.5
 MEDIUM CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
1.2
5.2
 Kubernetes
6.5
 MEDIUM CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
1.2
5.2
 NIST

CWE ids for CVE-2021-25735

  • The product does not properly determine which state it is in, causing it to assume it is in state X when in fact it is in state Y, causing it to perform incorrect operations in a security-relevant manner.
    Assigned by: jordan@liggitt.net (Secondary)
  • The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-25735

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