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TI-2021-03503 Aliases CVE-2021-20206GHSA-xjqr-g762-pxwp

Improper input validation in containernetworking-cni

Priority LOW 35CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 2 fixed, 8 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat.

Summary

An improper limitation of path name flaw was found in containernetworking/cni in versions before 0.8.1. When specifying the plugin to load in the 'type' field in the network configuration, it is possible to use special elements such as "../" separators to reference binaries elsewhere on the system. This flaw allows an attacker to execute other existing binaries other than the cni plugins/types, such as 'reboot'. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

Why it matters now

EPSS 0.01525 74th percentileScored 2026-11-07
Fix Partial github.com/containernetworking/cni (Go): 0.8.1Red Hat: 8 advisoriesRed Hat: 2 fixed, 8 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
—containernetworking-cnicontainernetworking/cni 0.8.1—No fix listedCNA
—github.com/containernetworking/cni (Go)before 0.8.10.8.1Patch availableGHSA-xjqr-g762-pxwp
  • containernetworking-cni Vendor— Affected containernetworking/cni 0.8.1 Fixed in — No fix listed CNA
  • github.com/containernetworking/cni (Go) Vendor— Affected before 0.8.1 Fixed in 0.8.1 Patch available GHSA-xjqr-g762-pxwp

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:linuxfoundation:container_network_interface:*:*:*:*:*:*:*:*before 0.8.1Vulnerablebackstage
  • cpe:2.3:a:linuxfoundation:container_network_interface:*:*:*:*:*:*:*:* Versions before 0.8.1 Vulnerable ·backstage

Remediation

  • Fix · GHSA-xjqr-g762-pxwp github.com/containernetworking/cni (Go) Fixed in 0.8.1 Advisory →

Red Hat 8 advisories

  • RHSA-2022:1660 Released 2022-05-02 · Red Hat rating Moderate
    Red Hat OpenShift support for Windows Containers 2.0.5 [security update]
    • Red Hat OpenShift Container Platform 4.7 openshift4-wincw/windows-machine-config-rhel8-operator
  • RHSA-2022:0492 Released 2022-02-16 · Red Hat rating Moderate
    OpenShift Container Platform 4.7.43 security update
    • Red Hat OpenShift Container Platform 4.7 openshift4/ose-container-networking-plugins-rhel8
  • RHSA-2021:3001 Released 2021-08-03 · Red Hat rating Moderate
    Red Hat OpenShift Container Platform for Windows Containers 3.0.0 security and bug fix update
    • Red Hat OpenShift Container Platform 4.8 openshift4-wincw/windows-machine-config-rhel8-operator
Show 5 more Red Hat advisories
  • RHSA-2021:2438 Released 2021-07-27 · Red Hat rating Moderate
    OpenShift Container Platform 4.8.2 bug fix and security update
    • Red Hat OpenShift Container Platform 4.8 openshift4/driver-toolkit-rhel8, openshift4/egress-router-cni-rhel8, openshift4/network-tools-rhel8 +47
  • RHSA-2021:1552 Released 2021-05-19 · Red Hat rating Moderate
    OpenShift Container Platform 4.7.11 security and bug fix update
    • Red Hat OpenShift Container Platform 4.7 openshift4/ose-sriov-dp-admission-controller, openshift4/ose-sriov-infiniband-cni
  • RHSA-2021:1005 Released 2021-04-05 · Red Hat rating Moderate
    OpenShift Container Platform 4.7.5 security and bug fix update
    • Red Hat OpenShift Container Platform 4.7 openshift4/ose-cluster-kube-controller-manager-operator, openshift4/ose-cluster-kube-scheduler-operator, openshift4/ose-cluster-policy-controller-rhel8 +1
  • RHSA-2021:1007 Released 2021-04-05 · Red Hat rating Moderate
    OpenShift Container Platform 4.7.5 security and bug fix update
    • Red Hat OpenShift Container Platform 4.7 openshift4/ose-cluster-kube-descheduler-operator, openshift4/ose-cluster-kube-descheduler-rhel8-operator, openshift4/ose-metering-ansible-operator +2
  • RHSA-2021:0799 Released 2021-03-10 · Red Hat rating Moderate
    OpenShift Virtualization 2.6.0 security and bug fix update
    • CNV 2.6 for RHEL 8 container-native-virtualization/kubevirt-cpu-model-nfd-plugin, container-native-virtualization/kubevirt-cpu-node-labeller, container-native-virtualization/kubevirt-kvm-info-nfd-plugin +2

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
OpenShift Service Mesh 2.0AffectedNo fix yet
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 8AffectedNo fix yet
Red Hat OpenShift Container Platform 3.11AffectedNo fix planned: Will not fix
Red Hat OpenShift Container Platform 4AffectedNo fix yet
Red Hat OpenShift Virtualization 2AffectedNo fix yet
Red Hat Openshift Container Storage 4AffectedNo fix planned: Will not fix
Red Hat Quay 3AffectedNo fix yet
Red Hat OpenShift Container Platform 4.7Fixed RHSA-2021:1005, RHSA-2021:1007, RHSA-2021:1552, RHSA-2022:0492, RHSA-2022:1660
Red Hat OpenShift Container Platform 4.8Fixed RHSA-2021:2438, RHSA-2021:3001
Not affected: 7 products
  • Red Hat Advanced Cluster Management for Kubernetes 2
  • Red Hat Enterprise Linux 9
  • Red Hat OpenShift Container Platform 3.11
  • Red Hat OpenShift Container Platform 4
  • Red Hat OpenShift Container Platform 4.7
  • Red Hat OpenShift Container Platform 4.8
  • Red Hat Openshift Container Storage 4

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-20206
  2. 2026-10-03 Alias added: GHSA-xjqr-g762-pxwp

References

Advisory 2

Other 3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences