CVE-2021-20206 — Vulnetix

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CVE-2021-20206 PUBLISHED

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.

EPSS 0.12% · 31.0th percentile

Risk Scores

EPSS Score

0.12%

31.0th percentile

Affected Products

Vendor	Product	Versions
Ubuntu:18.04:LTS	golang-github-appc-cni	0, 0.3.0+dfsg-1
Ubuntu:24.04:LTS	golang-github-appc-cni	0, 1.1.2-1
Ubuntu:25.10	golang-github-appc-cni	0, 1.1.2-1
Ubuntu:20.04:LTS	golang-github-appc-cni	0, 0.4.0+dfsg-1, 0.7.1-2
Ubuntu:22.04:LTS	golang-github-appc-cni	0, 0.8.1-1, 1.0.1-3

Timeline

Mar 26, 2021 CVE Published
Apr 14, 2021 EPSS Score
Jun 22, 2021 EPSS Score
Aug 23, 2021 EPSS Score
Dec 25, 2021 EPSS Score
Jan 6, 2022 EPSS Score
Feb 4, 2022 EPSS Score
Feb 25, 2022 EPSS Score
Apr 1, 2022 EPSS Score
Apr 28, 2022 EPSS Score
Aug 31, 2022 EPSS Score
Nov 1, 2022 EPSS Score

References

https://ubuntu.com/security/CVE-2021-20206 third-party-advisory
https://github.com/containernetworking/cni/pull/808 third-party-advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1919391 third-party-advisory
https://www.cve.org/CVERecord?id=CVE-2021-20206 third-party-advisory

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