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CVE-2020-8559

MediumPublished

Privilege escalation from compromised node to cluster

Published: Jul 22, 2020
Updated: Sep 16, 2024
Assigning CNA: kubernetes
Evidence observed: Aug 5, 2026

Primary CVSS

6.8/ 10Medium

nvd · CVSS 3.1

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

EPSS probability estimate

6.1%

Low · next 30 days

Percentile: 93.2%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

The Kubernetes kube-apiserver in versions v1.6-v1.15, and versions prior to v1.16.13, v1.17.9 and v1.18.6 are vulnerable to an unvalidated redirect on proxied upgrade requests that could allow an attacker to escalate privileges from a node compromise to a full cluster compromise.

Sources

CVE-2020-8559PoC
This is a PoC exploit for CVE-2020-8559 Kubernetes Vulnerability
POC-2020-8559PoC
Proof of Concept exploit for Kubernetes CVE-2020-8559

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