Linux Distros Unpatched Vulnerability : CVE-2021-20206

high Nessus Plugin ID 223674

Language:

Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

- 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.
(CVE-2021-20206)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

Plugin Details

Severity: High

ID: 223674

File Name: unpatched_CVE_2021_20206.nasl

Version: 1.4

Type: local

Agent: unix

Family: Misc.

Published: 3/4/2025

Updated: 9/15/2025

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 4.8

Vector: CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:P

CVSS Score Source: CVE-2021-20206

CVSS v3

Risk Factor: High

Base Score: 7.2

Temporal Score: 6.3

Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:buildah, p-cpe:/a:centos:centos:podman-gvproxy, p-cpe:/a:redhat:enterprise_linux:podman-docker, p-cpe:/a:canonical:ubuntu_linux:golang-github-appc-cni, p-cpe:/a:redhat:enterprise_linux:podman-catatonit, cpe:/o:centos:centos:8, p-cpe:/a:redhat:enterprise_linux:containernetworking-plugins, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:redhat:enterprise_linux:buildah-tests, p-cpe:/a:redhat:enterprise_linux:podman, p-cpe:/a:centos:centos:podman-tests, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:redhat:enterprise_linux:podman-remote, p-cpe:/a:centos:centos:podman-remote, p-cpe:/a:centos:centos:podman, cpe:/o:redhat:enterprise_linux:8, p-cpe:/a:redhat:enterprise_linux:podman-manpages, p-cpe:/a:centos:centos:podman-catatonit, p-cpe:/a:centos:centos:containernetworking-plugins, p-cpe:/a:centos:centos:buildah, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:centos:centos:podman-docker, cpe:/o:canonical:ubuntu_linux:25.04, p-cpe:/a:redhat:enterprise_linux:podman-gvproxy, p-cpe:/a:centos:centos:podman-manpages, p-cpe:/a:centos:centos:podman-plugins, p-cpe:/a:centos:centos:buildah-tests, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:redhat:enterprise_linux:podman-plugins, p-cpe:/a:redhat:enterprise_linux:podman-tests

Required KB Items: Host/local_checks_enabled, Host/cpu, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 2/12/2021

Reference Information

CVE: CVE-2021-20206

Detections

Analytics