🛡️ CVE-2020-8558 — kubernetes

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-420 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Improper Authentication in Kubernetes

A security issue was discovered in the Kubelet and kube-proxy components of Kubernetes 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. For example, if a cluster administrator runs a TCP service on a node that listens on 127.0.0.1:1234, because of this bug, that service would be potentially reachable by other hosts on the same LAN as the node, or by containers running on the same node as the service. If the example service on port 1234 required no additional authentication (because it assumed that only other localhost processes could reach it), then it could be vulnerable to attacks that make use of this bug.

How this vulnerability can be exploited

This issue can be reached from an adjacent network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Affected software

CVE-2020-8558 is recorded against 1 package.

  • k8s.io/kubernetes

Timeline and source

Published on 15 February 2022 and last revised on 4 February 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
bugzilla.redhat.com (Web)
cve.mitre.org (Web)
github.com (Package)
github.com (Web)
groups.google.com (Web)
groups.google.com (Web)
labs.bishopfox.com (Web)
security.netapp.com (Web)
www.openwall.com (Web)

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-420
Public Exploit ✅ No
Source OSV
Published 2022-02-15
Updated 2026-08-12
Modified 2026-02-04
Fix URL N/A

Affected Packages

Software From version Fixed in
k8s.io/kubernetes — —

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