CVE-2021-20206: Linuxfoundation Container Network Interface

High severity, CVSS 7.2. EPSS: 1.5% chance of exploitation in the next 30 days.

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.

Affected products

• Linuxfoundation Container Network Interface: before 0.8.1 (fixed in 0.8.1)

Published 2021-03-26. Last modified 2026-06-17.