How severe is CVE-2020-10749?

CVE-2020-10749 has a CVSS score of 6/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2020-10749?

CVE-2020-10749 affects the following packages: github.com/containernetworking/plugins (Go). Ecosystems affected: Go.

How do I fix CVE-2020-10749?

Update github.com/containernetworking/plugins to 0.8.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-10749 is resolved across your whole dependency graph.

How do I detect CVE-2020-10749 in my Go dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/containernetworking/plugins, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2020-10749 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2020-10749 actively exploited in the wild?

Yes. There are 2 known exploit references for CVE-2020-10749, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2020-10749?

CVE-2020-10749 has an EPSS (Exploit Prediction Scoring System) score of 2.1%, placing it in the 82th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2020-10749?

CVE-2020-10749 is classified as CWE-300 (CWE-300). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2020-10749 published, and has it been updated?

CVE-2020-10749 was published on June 3, 2020 and was last updated on October 24, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹

🐹 Go

Not in CISA KEV

MEDIUM severity

CVE-2020-10749 — plugins

MEDIUM

CVE-2020-10749 is a medium-severity (CVSS 6) CWE-300 vulnerability in github.com/containernetworking/plugins. 2 public exploit or proof-of-concept references are indexed, so weaponization risk is real. A fix is available for github.com/containernetworking/plugins — see the affected versions and patch details below.

containernetworking/plugins vulnerable to MitM attacks

Also known asGHSA-fx6x-h9g4-56f8GO-2023-1915

Published

Jun 3, 2020

Updated

Oct 24, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

2 known

Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

2.1%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs82th percentile — riskier than 82% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

🐹github.com/containernetworking/plugins

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

A vulnerability was found in all versions of containernetworking/plugins before version 0.8.6, that allows malicious containers in Kubernetes clusters to perform man-in-the-middle (MitM) attacks. A malicious container can exploit this flaw by sending rogue IPv6 router advertisements to the host or other containers, to redirect traffic to the malicious container.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/containernetworking/plugins`	all versions	0.8.6`go get github.com/containernetworking/plugins@v0.8.6`

Affected Products

4 products · 5 configurations

fedorafedoraproject

1 version

Application

cni network pluginslinuxfoundation

< 0.8.6

range

enterprise linuxredhat

2 versions

7.08.0

Application

openshift container platformredhat

1 version

4.0

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

A vulnerability was found in all versions of containernetworking/plugins…

github.comGithubJun 2020

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/containernetworking/plugins, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/containernetworking/plugins to 0.8.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-10749 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

In OpenShift Container Platform 4, the default network plugin, OpenShift SDN, and OVN Kubernetes, do not forward IPv6 traffic, making this vulnerability not exploitable. The affected code from containernetworking/plugins is however still included in these plugins, hence this vulnerability is rated Low for both…

Workaround published by Red Hat

Prevent untrusted, non-privileged containers from running with CAP_NET_RAW.

Source: Red Hat security advisory for CVE-2020-10749 (CC BY 4.0)

Product	Fixed in	Advisory
Red Hat Enterprise Linux 7 Extras	`containernetworking-plugins-0:0.8.3-3.el7_8`	RHSA-2020:2684
Red Hat Enterprise Linux 8	`container-tools:rhel8-8030020200923153805.2a301c24`	RHSA-2020:4694
Red Hat OpenShift Container Platform 4.2	`containernetworking-plugins-0:0.8.6-1.rhaos4.2.el7`	RHSA-2020:2592
Red Hat OpenShift Container Platform 4.3	`containernetworking-plugins-0:0.8.6-1.rhaos4.3.el7`	RHSA-2020:2443
Red Hat OpenShift Container Platform 4.4	`containernetworking-plugins-0:0.8.6-1.rhaos4.4.el7`	RHSA-2020:2403
Red Hat OpenShift Container Platform 4.5	`openshift4/ose-aws-machine-controllers:v4.5.0-202007012112.p0`	RHBA-2020:2409
Red Hat OpenShift Container Platform 4.5	`openshift4/ose-multus-cni:v4.5.0-202007012112.p0`	RHSA-2020:2412
Red Hat OpenShift Container Platform 4.7	`openshift4/ose-sdn-rhel8:v4.7.0-202102130115.p0`	RHSA-2020:5633

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2020-10749 in your dependencies?

Find it across Go, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

6/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

Low

Raw vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L

CWE Classification

CWE-300CWE-300

Weaponization

No Nuclei template or Metasploit module yet. 2 public proof-of-concept references are listed on this page.

OpenSSF Scorecard

Package health score

plugins

5.1/10

Maintained10/10

Code-Review10/10

Branch-Protection8/10

Assessed Oct 26, 2026

Timeline

Disclosed

Jun 3, 2020

First exploit

Jun 11, 2020

Last updated

Oct 24, 2026

Identifiers

CVE-2020-10749

GHSA-fx6x-h9g4-56f8

GO-2023-1915

References

Advisorylists.opensuse.org · msg00063 Advisorylists.opensuse.org · msg00065 Advisorynvd.nist.gov · CVE 2020 10749 Reportbugzilla.redhat.com · show bug.cgi Webgroups.google.com · forum Weblists.fedoraproject.org · DV3HCDZYUTPPVDUMTZXDKK6IUO3JMGJC Webgithub.com · v0.8.6 Webgroups.google.com · forum Weblists.fedoraproject.org · DV3HCDZYUTPPVDUMTZXDKK6IUO3JMGJC Packagegithub.com · plugins

Related vulnerabilities

Also affects plugins

This CVE is medium severity, in line with the other 1 CVE affecting plugins.

CVE-2025-67499

Same weakness: CWE-300

This CVE is medium severity; 7 of 7 other CVEs with CWE-300 are rated as high or higher (top: critical).

CVE-2024-39705CVE-2024-31206GHSA-j3rq-4xjw-xg63CVE-2019-16546CVE-2020-2185CVE-2009-3555CVE-2016-1000224Browse all CWE-300

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 24, 2026