CVE-2020-8559

Public Exploit
Privilege escalation from compromised node to cluster

Description

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.

Category

6.4
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 61.46% Top 5%
Third-Party Advisory github.com Third-Party Advisory google.com Third-Party Advisory netapp.com
Affected: Kubernetes Kubernetes
Published at:
Updated at:

References

Link Tags
https://groups.google.com/d/msg/kubernetes-security-announce/JAIGG5yNROs/19nHQ5wkBwAJ third party advisory exploit
https://github.com/kubernetes/kubernetes/issues/92914 issue tracking patch exploit third party advisory
https://security.netapp.com/advisory/ntap-20200810-0004/ third party advisory

Frequently Asked Questions

What is the severity of CVE-2020-8559?
CVE-2020-8559 has been scored as a medium severity vulnerability.
How to fix CVE-2020-8559?
To fix CVE-2020-8559, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-8559 being actively exploited in the wild?
It is possible that CVE-2020-8559 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~61% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-8559?
CVE-2020-8559 affects Kubernetes Kubernetes.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.