---
cve: "CVE-2020-8561"
severity: "MEDIUM"
cvss: 4.1
epss: "2.1%"
vendor: "Kubernetes"
kev: false
exploited: false
published: "2021-09-20 17:05:16"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T05:03:28+02:00"
---

# CVE-2020-8561

> 4.1 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Hoch | good |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Keine | good |
| A Verfügbarkeit | Keine | good |

## Referenzen

- <https://kubernetes.io/blog/2026/05/26/reconciling-unfixed-kubernetes-cves/>
- <https://groups.google.com/g/kubernetes-security-announce/c/RV2IhwcrQsY>
- <https://github.com/kubernetes/kubernetes/issues/104720>
- <https://security.netapp.com/advisory/ntap-20211014-0002/>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2020-8561) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_