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MEDIUM severity

Improper Certificate Validation in OPCFoundation.NetStandard.Opc.Ua.CoreGHSA-mjww-934m-h4jw

MEDIUMFix: OPCFoundation/UA-.NETStandard#1229

GHSA-mjww-934m-h4jw is a medium-severity (CVSS 4.4) CWE-295 vulnerability in OPCFoundation.NetStandard.Opc.Ua.Core. A fix is available for OPCFoundation.NetStandard.Opc.Ua.Core — see the affected versions and patch details below.

Also known asCVE-2020-29457
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs22th percentile — riskier than 22% of all scored CVEsHighest risk
0.00%0.27%0.54%0.81%0.1%0.3%Apr 26Aug 26Oct 26

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

How urgent is this, really

GHSA-mjww-934m-h4jw 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
.NETOPCFoundation.NetStandard.Opc.Ua.Core

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

Description

A Privilege Elevation vulnerability in OPC UA .NET Standard Stack 1.4.363.107 allows attackers to establish a connection using invalid certificates.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
.NETNuGetOPCFoundation.NetStandard.Opc.Ua.Coreall versions1.4.365.10dotnet add package OPCFoundation.NetStandard.Opc.Ua.Core --version 1.4.365.10

Affected Products

1 product · 1 configurations
Application
ua-.netstandardopcfoundation
< 1.4.365.10
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 OPCFoundation.NetStandard.Opc.Ua.Core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update OPCFoundation.NetStandard.Opc.Ua.Core to 1.4.365.10 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-mjww-934m-h4jw is resolved across your whole dependency graph.

  3. 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.

Frequently Asked Questions

A Privilege Elevation vulnerability in OPC UA .NET Standard Stack 1.4.363.107 allows attackers to establish a connection using invalid certificates.
O3 Security · Impact-Aware SCA

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