CVE-2021-27432: Opcfoundation Ua-.net-Legacy

High severity, CVSS 7.5. EPSS: 2% chance of exploitation in the next 30 days.

OPC Foundation UA .NET Standard versions prior to 1.4.365.48 and OPC UA .NET Legacy are vulnerable to an uncontrolled recursion, which may allow an attacker to trigger a stack overflow.

Affected products

• Opcfoundation Ua-.net-Legacy: affected versions not specified
• Opcfoundation Ua .net Standard Stack: before 1.4.365.48 (fixed in 1.4.365.48)

Published 2021-05-20. Last modified 2026-06-17.