CVE-2020-8559

Name: CVE-2020-8559
Creator: NVD / NIST
Published: 2020-07-22T14:15:16.517+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.8/10EPSS 6.10%

Last modified Jun 17, 2026

CVE-2020-8559 is a medium-severity vulnerability rated 6.8/10 on the CVSS scale. 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.. EPSS estimates a 6.10% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.8/10

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

EPSS Probability

6.10%

92.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Kubernetes	Kubernetes	>= 1.6.0, <= 1.15.0
Kubernetes	Kubernetes	>= 1.16.0, < 1.16.13
Kubernetes	Kubernetes	>= 1.17.0, < 1.17.9
Kubernetes	Kubernetes	>= 1.18.0, < 1.18.6

References

https://github.com/kubernetes/kubernetes/issues/92914Exploit, Issue Tracking, Patch, Third Party Advisory
https://groups.google.com/d/msg/kubernetes-security-announce/JAIGG5yNROs/19nHQ5wkBwAJExploit, Third Party Advisory
https://security.netapp.com/advisory/ntap-20200810-0004/Third Party Advisory
https://github.com/kubernetes/kubernetes/issues/92914Exploit, Issue Tracking, Patch, Third Party Advisory
https://groups.google.com/d/msg/kubernetes-security-announce/JAIGG5yNROs/19nHQ5wkBwAJExploit, Third Party Advisory
https://security.netapp.com/advisory/ntap-20200810-0004/Third Party Advisory

Timeline

Published: Jul 22, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-8559?

How severe is CVE-2020-8559?

CVE-2020-8559 has a CVSS score of 6.8/10 (MEDIUM severity). The EPSS model estimates a 6.10% probability of exploitation in the next 30 days.

How do I fix CVE-2020-8559?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-8559?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST