CVE-2019-19135: Opcfoundation Netstandard.opc.ua

High severity, CVSS 7.4. EPSS: 1% chance of exploitation in the next 30 days.

In OPC Foundation OPC UA .NET Standard codebase 1.4.357.28, servers do not create sufficiently random numbers in OPCFoundation.NetStandard.Opc.Ua before 1.4.359.31, which allows man in the middle attackers to reuse encrypted user credentials sent over the network.

Affected products

• Opcfoundation Netstandard.opc.ua: before 1.4.359.31 (fixed in 1.4.359.31)
• Opcfoundation Ua-.netstandard: version 1.4.357.28 only

Published 2020-03-16. Last modified 2026-06-17.