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MEDIUM severity

CVE-2024-45526 — OPCFoundation.NetStandard…

MEDIUM

CVE-2024-45526 is a medium-severity (CVSS 5.3) CWE-770 vulnerability in OPCFoundation.NetStandard.Opc.Ua. A fix is available for OPCFoundation.NetStandard.Opc.Ua — see the affected versions and patch details below.

Security Update for the OPC UA .NET Standard Stack

Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2024-45526.

EPSS Exploitation Probability

via FIRST.org ↗
0.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs43th percentile — riskier than 43% of all scored CVEsHighest risk
0.00%0.33%0.67%1.00%0.3%0.5%May 26Sep 26Nov 26

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

2 pkgs affected
.NETOPCFoundation.NetStandard.Opc.Ua.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

An issue was discovered in OPC Foundation OPCFoundation/UA-.NETStandard through 1.5.374.78. A remote attacker can send requests with invalid credentials and cause the server performance to degrade gradually.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
.NETNuGetOPCFoundation.NetStandard.Opc.Uaall versions1.5.374.118dotnet add package OPCFoundation.NetStandard.Opc.Ua --version 1.5.374.118
.NETNuGetOPCFoundation.NetStandard.Opc.Ua.Coreall versions1.5.374.118dotnet add package OPCFoundation.NetStandard.Opc.Ua.Core --version 1.5.374.118

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, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update OPCFoundation.NetStandard.Opc.Ua to 1.5.374.118 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-45526 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

This security update resolves a vulnerability in the OPC UA .NET Standard Stack that allows an unauthorized attacker to trigger a gradual degradation in performance.
O3 Security · Impact-Aware SCA

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CVE-2024-45526: OPCFoundation — Fixed in 1.5.374.118