Skip to main content
Public proof of conceptFix available

CVE-2020-8558

A public proof of concept exists; no exploitation attested.

  • Published2020-07-27
  • WeaknessCWE-420

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2020-07-2720:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-8558?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-8558?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Kubernetes
BranchAffectedFixed in
1.x≥ 1.1.0, ≤ 1.16.10no fix published
1.17≥ 1.17.0, ≤ 1.17.6no fix published
1.18≥ 1.18.0, ≤ 1.18.3no fix published
k8s.io/kubernetes
BranchAffectedFixed in
1.18≥ 1.18.0, < 1.18.41.18.4
1.17≥ 1.17.0, < 1.17.71.17.7
1.16< 1.16.111.16.11

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • atomic-openshiftRed Hat:openshift:3.11::el7all versions · fixed in 0:3.11.248-1.git.0.92ee8ac.el7and 12 other packages
  • atomic-openshift-web-consoleRed Hat:openshift:3.11::el7all versions · fixed in 0:3.11.248-1.git.1.cc96c2d.el7
  • cri-oRed Hat:openshift:3.11::el7all versions · fixed in 0:1.11.16-0.10.dev.rhaos3.11.git1eee681.el7and 1 other package
  • govulncheck-vulndbopenSUSE:Tumbleweedall versions · fixed in 0.0.20250807T150727-1.1
  • kubeflow-pipelinesWolfiall versions · fixed in 0
  • kubeflow-pipelinesChainguardall versions · fixed in 0
  • kubernetesDebian:14all versions · fixed in 1.18.5-1
  • kubernetesDebian:13all versions · fixed in 1.18.5-1

9 more package ranges on OSV.dev

Vendor advisories

  • CVE-2020-8558 Red Hat Product Security200 products fixed

    kubernetes: node localhost services reachable via martian packets

  • RHBA-2020:4196 Red Hat Product Security151 products fixed

    Red Hat Bug Fix Advisory: OpenShift Container Platform 4.6 GA Images

  • RHSA-2020:3184 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.3.31 openshift-enterprise-hyperkube-container security update

  • RHSA-2020:3183 Red Hat Product Security8 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.3.31 openshift security update

  • RHSA-2020:2992 Red Hat Product Security24 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 3.11 security update

  • RHSA-2020:2926 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.4.13 openshift-enterprise-hyperkube-container security update

3 more advisories

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHBA-2020:4196 · 151 productsFor OpenShift Container Platform 4.6 see the following documentation, which will be updated shortly for release 4.6.1, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.6/release_notes/ocp-4-6-…
  2. Vendor fix Red Hat Product Security RHSA-2020:3184 · 3 productsFor OpenShift Container Platform 4.3 see the following documentation, which will be updated shortly for release 4.3.32, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.3/release_notes/ocp-4-3…
  3. Vendor fix Red Hat Product Security RHSA-2020:2992 · 24 productsSee the following documentation, which will be updated shortly for release 3.11.z, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/3.11/release_notes/ocp_3_11_release_notes.html This update is…
  4. Vendor fix Red Hat Product Security RHSA-2020:2926 · 3 productsFor OpenShift Container Platform 4.4 see the following documentation, which will be updated shortly for release 4.4.13, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.4/release_notes/ocp-4-4…
  5. Vendor fix Red Hat Product Security RHSA-2020:2412 · 1 productFor OpenShift Container Platform 4.5 see the following documentation, which will be updated shortly for release 4.5.1, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.5/release_notes/ocp-4-5-…

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
2 repositories, unverifiedtabbysable/POC-2020-8558rhysemmas/martian-packets
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.15.4known since 2026-10-23
  • NVDCVSS 3.18.8read 2026-10-23
  • NVDCVSS 2.05.8read 2026-10-23
  • CNAweakness (CWE)CWE-420known since 2026-10-23
  • FIRST EPSSEPSS score3.4 %2026-11-03
  • PoC-in-GitHubproof of concept2read 2026-11-02
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2021-05-24

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2020-07-27
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-wqv3-8cm6-h6wg

Frequently asked questions

What is CVE-2020-8558?

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.

Is CVE-2020-8558 actively exploited?

Active exploitation of CVE-2020-8558 has not been confirmed. Its EPSS score was 3.4% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-8558?

CVE-2020-8558 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Running Kubernetes? Hear about its next vulnerability

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, October 2026Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database

Sources for this record