---
title: "CVE-2020-8562\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2020-8562?format=md
keywords: index, follow
---

# CVE-2020-8562

Publication date 1 February 2022

Last updated 11 July 2025

---

Ubuntu priority

**Low**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**2.2 · Low**

[Score breakdown](https://ubuntu.com/security/CVE-2020-8562?format=md#impact-score)

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## Description

As mitigations to a report from 2019 and CVE-2020-8555, Kubernetes attempts
to prevent proxied connections from accessing link-local or localhost
networks when making user-driven connections to Services, Pods, Nodes, or
StorageClass service providers. As part of this mitigation Kubernetes does
a DNS name resolution check and validates that response IPs are not in the
link-local (169.254.0.0/16) or localhost (127.0.0.0/8) range. Kubernetes
then performs a second DNS resolution without validation for the actual
connection. If a non-standard DNS server returns different non-cached
responses, a user may be able to bypass the proxy IP restriction and access
private networks on the control plane.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2020-8562?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| kubernetes | 25.04 plucky | Not in release |
| 24.10 oracular | Ignored end of life, was needs-triage |
| 24.04 LTS noble | Not affected |
| 23.10 mantic | Ignored end of life, was needs-triage |
| 23.04 lunar | Ignored end of life, was needs-triage |
| 22.10 kinetic | Ignored end of life, was needs-triage |
| 22.04 LTS jammy | Not affected |
| 21.10 impish | Ignored end of life |
| 21.04 hirsute | Ignored end of life |
| 20.10 groovy | Ignored end of life |
| 20.04 LTS focal | Not affected |
| 18.04 LTS bionic | Not in release |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Notes

---

### [leosilva](https://launchpad.net/~leosilva)

kubernates is in fact a kubernetes installer
that calls snap, not the package it self.

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

2.2 · Low

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | High |
  | Privileges required | High |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | Low |
  | Integrity impact | None |
  | Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 2.2 · Low |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8562)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2020-8562)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2020-8562)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2020-8562)

### Other references

* <https://www.openwall.com/lists/oss-security/2021/05/04/8>
* <https://www.cve.org/CVERecord?id=CVE-2020-8562>