CVE-2018-7559: Opcfoundation Ua-.net-Legacy

Medium severity, CVSS 5.3. EPSS: 1.2% chance of exploitation in the next 30 days.

An issue was discovered in OPC UA .NET Standard Stack and Sample Code before GitHub commit 2018-04-12, and OPC UA .NET Legacy Stack and Sample Code before GitHub commit 2018-03-13. A vulnerability in OPC UA applications can allow a remote attacker to determine a Server's private key by sending carefully constructed bad UserIdentityTokens as part of an oracle attack.

Affected products

• Opcfoundation Ua-.net-Legacy: up to and including 1.03.342
• Opcfoundation Ua-.netstandard: up to and including 1.03.352.10

Published 2018-06-13. Last modified 2026-06-17.