CVE-2020-8561
MEDIUM4.1EPSS 0.18%Confused Deputy in Kubernetes
Published: 9/21/2021Modified: 4/28/2026
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 packages (2)
- Debian/kubernetesfrom 0, < 1.20.5+really1.20.2-1
- Go/k8s.io/kubernetesfrom 0, <= 1.22.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.1 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N |
References (6)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2020-8561
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2020-8561
- PATCHhttps://github.com/kubernetes/kubernetes
- WEBhttps://github.com/kubernetes/kubernetes/issues/104720
- WEBhttps://groups.google.com/g/kubernetes-security-announce/c/RV2IhwcrQsY
- WEBhttps://security.netapp.com/advisory/ntap-20211014-0002