CVE-2020-8561

Webhook redirect in kube-apiserver

MEDIUM
4.1
CVSS Score
Published: September 20, 2021 at 05:05 PM UTC
Updated: June 17, 2026 at 03:26 AM UTC
1 product affected across 1 vendorKubernetes

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Severity
MEDIUM4.1
Exploit prediction
EPSS 2%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

4.1MEDIUMkubernetes
Attack Vector
NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-441CWE-610

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