CVE-2019-19135

Severity: high (CVSS 7.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-03-16 · updated 2026-06-17
Weakness: CWE-330

Description

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: 1.4.357.28

How to fix

Upgrade to a fixed version: Opcfoundation Netstandard.Opc.Ua 1.4.359.31. Check the vendor advisory for mitigations.

References

https://opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2019-19135.pdf
https://opcfoundation.org/security-bulletins/
https://opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2019-19135.pdf
https://opcfoundation.org/security-bulletins/

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