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MEDIUM severity

Improper Input ValidationGHSA-57v4-m9jx-mh8r

MEDIUMFix: ovn-org/ovn-kubernetes#2169

GHSA-57v4-m9jx-mh8r is a medium-severity (CVSS 5.6) CWE-863 vulnerability in github.com/ovn-org/ovn-kubernetes. No vendor fix is recorded yet; mitigation options are listed below.

Also known asCVE-2021-3499
Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
None indexed
Exploitation data as of Oct 12, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs55th percentile — riskier than 55% of all scored CVEsHighest risk
0.00%0.43%0.87%1.30%0.1%0.8%Apr 26Aug 26Oct 26

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

How urgent is this, really

GHSA-57v4-m9jx-mh8r by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐹github.com/ovn-org/ovn-kubernetes

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 OVN Kubernetes in versions up to and including 0.3.0 where the Egress Firewall does not reliably apply firewall rules when there is multiple DNS rules. It could lead to potentially lose of confidentiality, integrity or availability of a service.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/ovn-org/ovn-kubernetesall versionsNo fix

Affected Products

1 product · 1 configurations
Application
ovn-kubernetesovn
≤ 0.3.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Remediation status

    No patched version of github.com/ovn-org/ovn-kubernetes has shipped for GHSA-57v4-m9jx-mh8r yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

  3. Mitigate without a patch

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

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 Container Network Interface (CNI) network provider plug-in is OpenShift SDN, and it's not affected by this flaw. Only the OVN-Kubernetes CNI network provider is affected.

ProductFixed inAdvisory
Red Hat OpenShift Container Platform 4.7openshift4/driver-toolkit-rhel8:v4.7.0-202105102252.p0RHBA-2021:1550

Frequently Asked Questions

A vulnerability was found in OVN Kubernetes in versions up to and including 0.3.0 where the Egress Firewall does not reliably apply firewall rules when there is multiple DNS rules. It could lead to potentially lose of confidentiality, integrity or availability of a service
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Improper Input Validation (Medium 5.6)