CVE-2020-8562

    Dashboard / Vulnerabilities / CVE-2020-8562

    CVE-2020-8562

    Published: 1 Feb 2022Last Modified: 7 Aug 2026

    Summary:

    Details: 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.

    References: https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOY, https://security.netapp.com/advisory/ntap-20220225-0002/, https://github.com/kubernetes/kubernetes/issues/101493, https://kubernetes.io/blog/2026/05/26/reconciling-unfixed-kubernetes-cves/

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    1.21.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2020-8562 | CVE-DB