CVE-2020-8561
Webhook redirect in kube-apiserver
MEDIUM 4.1EPSS 2.1%
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
- Kubernetes
- CVSS v3.1 NVD
- 4.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N - CVSS v2.0 NVD
- 4.0 MEDIUM
AV:N/AC:L/Au:S/C:P/I:N/A:N - EPSS
- 2.10% chance of exploitation in the next 30 days, 81st percentile
- Published
- 2021-09-20
- Updated
- 2026-06-01
Proof-of-concept exploits (1)
- raesene/vuln_pocs5★ · 2026-09-24
Security advisories
- kubernetes/kubernetes/issues/104720
- https://security.netapp.com/advisory/ntap-20211014-0002
- advisories/GHSA-74j8-88mm-7496
- https://groups.google.com/g/kubernetes-security-announce/c/RV2IhwcrQsY