CVE catalog

CVE-2020-8559

kubernetes: CVE-2020-8559

Severity: Medium · CVSS 6.4CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H
Published: Jul 15, 2020, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 6.10% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	kubernetes	sid	`1.36.4+ds-1`	fixed
Debian	kubernetes	forky	`1.36.4+ds-1`	fixed
Debian	kubernetes	trixie	`1.32.3+ds-2`	fixed
Debian	kubernetes	bookworm	`1.20.5+really1.20.2-1.1+deb12u1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	kubernetes	source	sid	`1.18.5-1`	not yet assigned	Not reported	Not reported
Debian	kubernetes	source	forky	`1.18.5-1`	not yet assigned	Not reported	Not reported
Debian	kubernetes	source	trixie	`1.18.5-1`	not yet assigned	Not reported	Not reported
Debian	kubernetes	source	bookworm	`1.18.5-1`	not yet assigned	Not reported	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[kubernetes-client]Fixed
Source package: [kubernetes]
Details (2)
- 1.20.5+really1.20.2-1.1+deb12u1 · amd64 · bookworm
  Fixed · Fixed: 1.18.5-1
  dsa · kubernetes · debian · bookworm; dsa · kubernetes · debian · 12
- 1.20.5+really1.20.2-1.1+deb12u1 · arm64 · bookworm
  Fixed · Fixed: 1.18.5-1
  dsa · kubernetes · debian · bookworm; dsa · kubernetes · debian · 12

[Debian 13 (Trixie)]

[golang-k8s-kubectl-dev]Fixed
Source package: [kubernetes]
Details (2)
- 1.32.3+ds-2 · all · trixie
  Fixed · Fixed: 1.18.5-1
  dsa · kubernetes · debian · 13
- 1.32.3+ds-2 · all · trixie
  Fixed · Fixed: 1.18.5-1
  dsa · kubernetes · debian · 13
[kubectl]Fixed
Source package: [kubernetes]
Details (2)
- 1.32.3+ds-2 · amd64 · trixie
  Fixed · Fixed: 1.18.5-1
  dsa · kubernetes · debian · 13
- 1.32.3+ds-2 · arm64 · trixie
  Fixed · Fixed: 1.18.5-1
  dsa · kubernetes · debian · 13
[kubernetes-client]Fixed
Source package: [kubernetes]
Details (2)
- 1.32.3+ds-2 · amd64 · trixie
  Fixed · Fixed: 1.18.5-1
  dsa · kubernetes · debian · 13
- 1.32.3+ds-2 · arm64 · trixie
  Fixed · Fixed: 1.18.5-1
  dsa · kubernetes · debian · 13

Observed: Oct 23, 2026, 5:53:32 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]