What is CVE-2020-8559?

CVE-2020-8559 is a medium-severity vulnerability in Kubernetes, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.4/10. Published 2020-07-22.

How severe is CVE-2020-8559?

Medium severity. CVSS v3 base score is 6.4 out of 10.

Is CVE-2020-8559 known to be exploited?

28 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Open Redirect in Kubernetes

CVE-2020-8559

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…

Vulnerability class: Open Redirect

EPSS: 0.512 (97.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H.

Affected products

Kubernetes — versions 1.6, 1.7, 1.8

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

Public proof-of-concept exploits

References

groups.google.com/d/msg/kubernetes-security-announce/JAIGG5yNROs/19nHQ5wkBwAJ (x_refsource_MISC)
github.com/kubernetes/kubernetes/issues/92914 (x_refsource_MISC)
security.netapp.com/advisory/ntap-20200810-0004/ (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2020-8559?: CVE-2020-8559 is a medium-severity vulnerability in Kubernetes, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.4/10. Published 2020-07-22.
How severe is CVE-2020-8559?: Medium severity. CVSS v3 base score is 6.4 out of 10.
Is CVE-2020-8559 known to be exploited?: 28 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.