OPC Foundation .net DLLs vulnerability update,|Classic OPC: DA, A&E, HDA, XML-DA, etc.|Forum|OPC Foundation

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OPC Foundation .net DLLs vulnerability update,
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Hannah Luu
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07/23/2024
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11/10/2025 - 14:46
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I am new to OPC Classic. I need help with guidance on how to update the runtime .NET to a version newer than 3.5.

There is a need to update the OPC Foundation .net DLLs to remove the dependency on deprecated .NET versions that potentially increase the risk of vulnerability from a cyber security aspect.

These are the .dlls our Cyber team are finding delivered that are showing dependencies on deprecated .NET versions:

FileName Dependency (mscorlib/.net version)
opcnetapi.com.dll v2.0
opcnetapi.dll v2.0
opcnetapi.xml.dll v2.0
opcrcw.ae.dll v1.0.5000.0
opcrcw.batch.dll v1.0.5000.0
opcrcw.cmd.dll v1.0.5000.0
opcrcw.comn.dll v1.0.5000.0
opcrcw.da.dll v1.0.5000.0
opcrcw.dx.dll v1.0.5000.0
opcrcw.hda.dll v1.0.5000.0
opcrcw.sec.dll v1.0.5000.0

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Randy Armstrong
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05/30/2017
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11/11/2025 - 05:18
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The DLLs have been replaced by new opcnetapi DLLs that support the latest .NET framework.

netstandard2.1;netstandard2.0;net46

https://opcfoundation.org/deve.....-packages/

If all of your OPC apps use later versions of .NET you should be able to safely delete opcrcw.* 

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