CVE-2021-20206
No exploitation reported by the sources we read.
- Published2021-03-26
- Fixed in0.8.1
- WeaknessCWE-20 · CWE-22
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « 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
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.
Timeline
dates in UTC- 2021-03-2622:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-20206?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-20206?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 0.8 | < 0.8.1 | 0.8.1 | NVD |
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.
Vendor advisories
Red Hat Security Advisory: OpenShift Container Platform 4.8.2 bug fix and security update
Fix
- Update Linuxfoundation container network interface to 0.8.1
- Vendor fix Red Hat Product Security RHSA-2021:2438 · 6 productsFor OpenShift Container Platform 4.8 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.8/release_notes/ocp-4-8-r…
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
- NVDCVSS 3.17.2read 2026-10-23
- NVDCVSS 2.06.5read 2026-10-23
- CNAweakness (CWE)CWE-20read 2026-10-23
- NVDweakness (CWE)CWE-22read 2026-10-23
- FIRST EPSSEPSS score1.5 %2026-10-22
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- Published
- 2021-03-26
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2021-20206?
Is CVE-2021-20206 actively exploited?
What is the CVSS score for CVE-2021-20206?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.