THREATPORT/VULNERABILITY/CVE-2021-25735
MEDIUM SEVERITY

CVE-2021-25735

Kubernetes vulnerability

CVSS
6.5
EPSS
5.5%
EPSS pct
92th
Exploited
No known
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.
Affected vendor
Kubernetes
Affected product
Kubernetes
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
Weakness type (CWE)
Published
2021-09-06

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring high privileges, no user interaction. Successful exploitation leads to high impact to integrity, high impact to availability.

Its EPSS score of 5.5% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 92% of all scored CVEs.

Check your external exposure to CVE-2021-25735

  • Confirm whether Kubernetes Kubernetes is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-25735.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-25735

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