CVE-2020-8558

What it is

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.

At a glance

Exploitability

Can be exploited from the same network segment without logging in. Limited direct impact.

Exploit odds

3.4% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2020-07-27 20:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 03:26 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 3.4% in the next 30 days (EPSS).
• Severity: 5.4 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2020-07-27 20:15 UTC

Last modified

2026-06-17 03:26 UTC

Exploit probability

3.4% · EPSS, next 30 days

Weakness

CWE-420

Record status

Modified

Affected

• Kubernetes ≤ 1.16.10
• Kubernetes ≤ 1.17.6
• Kubernetes ≤ 1.18.3

Attack profile CVSS 3.1 · 5.4

Attack vector

Adjacent network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2020-8558.md and follow it. Check whether this project is affected by CVE-2020-8558. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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