Is CVE-2020-8561 in the CISA KEV catalog?

No. CVE-2020-8561 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-8561?

CVE-2020-8561 has a CVSS v3 base score of 4.1 (MEDIUM).

What is the EPSS score for CVE-2020-8561?

CVE-2020-8561 has an EPSS score of 1.95% (78th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-8561?

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

CVE & CISA-KEV Catalog

CVE-2020-8561

MEDIUMEPSS 78th pctl

4.1

CVSS v3

NVD

Description

A security issue was discovered in Kubernetes where actors that control the responses of MutatingWebhookConfiguration or ValidatingWebhookConfiguration requests are able to redirect kube-apiserver requests to private networks of the apiserver. If that user can view kube-apiserver logs when the log level is set to 10, they can view the redirected responses and headers in the logs.

CWE-441 CWE-610

How to fix

Remediation Available

kubernetesDebian

Fixed in:1.20.5+really1.20.2-1CVE-2020-8561

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

ScopeChanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

1.95%probability of exploitation in 30 days

78thpercentile

Elevated risk: more likely to be exploited than 78% of all known CVEs.

References

Mitigation2

Third-Party Advisory1

security.netapp.com

Other references1

kubernetes.io

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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 2026-06-01.