CVE-2020-8559
Privilege escalation from compromised node to cluster
- Published
- Updated
- Reserved
- Assigned by
- kubernetes
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.
Timeline
ID reserved
By kubernetes
- 6 months later
· 6 months later
Published
- 4 years later
· 4 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| kubernetesCNA (assigner) | 3.1 | Medium6.4 | CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Medium6.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 6.1% · top 6.5% of all CVEs (7 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.4.
Weakness
Affected products
- affected 1.6
- affected 1.7
- affected 1.8
- affected 1.9
- affected 1.10
- affected 1.11
- affected 1.12
- affected 1.13
- affected 1.14
- affected 1.15
- affected 1.16 – ≤ 1.16.12
- affected 1.17 – ≤ 1.17.8
- affected 1.18 – ≤ 1.18.5
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gok8s.io/apimachineryGHSA-33c5-9fx5-fvjm (opens in a new tab)
- Gok8s.io/kubernetesGHSA-33c5-9fx5-fvjm (opens in a new tab)
References (3)
- https://groups.google.com/d/msg/kubernetes-security-announce/JAIGG5yNROs/19nHQ5wkBwAJ (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/kubernetes/kubernetes/issues/92914 (opens in a new tab)x_refsource_MISCx_transferred
- https://security.netapp.com/advisory/ntap-20200810-0004/ (opens in a new tab)x_refsource_CONFIRMx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-33c5-9fx5-fvjm (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2020-8559)Record last updated .