CVE-2020-8558
Kubernetes node setting allows for neighboring hosts to bypass localhost boundary
- Published
- Jul 27, 2020
- Updated
- Sep 16, 2024
- Assigning CNA
- kubernetes
- Evidence observed
- Aug 4, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HLow · next 30 days
- Percentile
- 88.9%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
The Kubelet and kube-proxy components in versions 1.1.0-1.16.10, 1.17.0-1.17.6, and 1.18.0-1.18.3 were found to contain a security issue which allows adjacent hosts to reach TCP and UDP services bound to 127.0.0.1 running on the node or in the node's network namespace. Such a service is generally thought to be reachable only by other processes on the same host, but due to this defeect, could be reachable by other hosts on the same LAN as the node, or by containers running on the same node as the service.
Sources
2Crafting raw TCP/IP packets to send to poorly configured Kubernetes servers - CVE-2020-8558 PoC
- POC-2020-8558Exploit
Information about Kubernetes CVE-2020-8558, including proof of concept exploit.
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