Is CVE-2021-25735 in the CISA KEV catalog?

No. CVE-2021-25735 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-25735?

CVE-2021-25735 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2021-25735?

CVE-2021-25735 has an EPSS score of 5.52% (92th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-25735?

Upgrade kubernetes on debian 11 to 1.20.5+really1.20.2-1 or later.

CVE & CISA-KEV Catalog

CVE-2021-25735

MEDIUMEPSS 92th pctl

6.5

CVSS v3

NVD

Description

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.

CWE-372

How to fix

Remediation Available

kubernetesDebian

Fixed in:1.20.5+really1.20.2-1CVE-2021-25735

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H

Exploit Intelligence

5.52%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

References

Patch1

github.com

Third-Party Advisory1

groups.google.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.