CVE-2020-8555
Kubernetes kube-controller-manager SSRF
- Published
- Updated
- Reserved
- Assigned by
- kubernetes
Description
The Kubernetes kube-controller-manager in versions v1.0-1.14, versions prior to v1.15.12, v1.16.9, v1.17.5, and version v1.18.0 are vulnerable to a Server Side Request Forgery (SSRF) that allows certain authorized users to leak up to 500 bytes of arbitrary information from unprotected endpoints within the master's host network (such as link-local or loopback services).
Timeline
ID reserved
By kubernetes
- 4 months later
· 4 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 | Medium6.3 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N |
| NVDNVD · Modified | 3.1 | Medium6.3 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 3.7% · top 10% of all CVEs (7 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.3.
Weakness
Affected products
- affected 1.18.0
- affected 1.1
- affected 1.2
- affected 1.3
- affected 1.4
- affected 1.5
- 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 – < 1.15.12
- affected 1.16 – < 1.16.9
- affected 1.17 – < 1.17.5
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gok8s.io/kubernetesGHSA-x6mj-w4jf-jmgw (opens in a new tab)
What to do
Workaround: Prior to upgrading, this vulnerability can be mitigated by adding endpoint protections on the master or restricting usage of the vulnerable volume types (for example by constraining usage with a PodSecurityPolicy or third-party admission controller such as Gatekeeper) and restricting StorageClass write permissions through RBAC.
References (6)
- [oss-security] 20200601 CVE-2020-8555: Kubernetes: Half-Blind SSRF in kube-controller-manager (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- https://groups.google.com/d/topic/kubernetes-security-announce/kEK27tqqs30/discussion (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- https://github.com/kubernetes/kubernetes/issues/91542 (opens in a new tab)x_refsource_CONFIRMx_transferred
- FEDORA-2020-aeea04cd13 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- https://security.netapp.com/advisory/ntap-20200724-0005/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- [oss-security] 20210504 [kubernetes] CVE-2020-8562: Bypass of Kubernetes API Server proxy TOCTOU (opens in a new tab)mailing-listx_refsource_MLISTx_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-x6mj-w4jf-jmgw (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-2020-8555)Record last updated .