CVE-2020-8561 - CVE House
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Status published Medium CVE-2020-8561

Webhook redirect in kube-apiserver

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • QiQi Xu

References

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Affected Vendor

Affected Software

Kubernetes
Vulnerable Versions:
0

Timeline

Official Publish: September 20th, 2021
Last Modified: June 1st, 2026
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N

Weaknesses (CWE)

CWE-441

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.