OPC UA Buffer Overflow Exploit

OPC Foundation (OPCF) has announced a Security Bulletin (CVE-2018-12086) on September 12, 2018 concerning a vulnerability in the OPC UA Java Stack of OPC Foundation:

"Buffer overflow in OPC UA applications allows remote attackers to trigger a stack overflow with carefully structured requests."

Prosys OPC UA products affected

The vulnerability affects directly:

All applications built with Prosys OPC UA Java SDK 3.1.2 and earlier
Prosys OPC UA Client 3.0.0 and earlier
Prosys OPC UA Simulation Server 3.0.0 and earlier
Prosys OPC UA Modbus Server 1.2.2 and earlier
Prosys OPC UA Historian 1.0.0

Fixed products

The issue has been fixed in Prosys OPC UA Java SDK 3.1.4, UA Client 3.1.4, Simulation Server 3.1.4 and Modbus Server 1.2.4 and we encourage everyone to update to these versions. Prosys OPC UA Historian will be updated later, respectively.

Unified Automation products affected

Unified Automation has released a public security bulletin regarding the issue.

More security information

You will find the currently announced security issues in Prosys OPC products from the blog under the Security tag.

You might also like to read about the OPC UA Security Process of the OPC Foundation.

Jouni Aro

Chief Technology Officer

Email: jouni.aro@prosysopc.com

i-GuSystem – From MTConnect to OPC UA: Future-Proof CNC Data Collection with Forge

August 20, 2025 No Comments

i-GuSystem Ltd., a Finnish specialist in CNC program transfer and production data acquisition, adopted Prosys OPC UA Forge to extend its data integration from MTConnect into the OPC UA era, ensuring future-proof and scalable solutions. To meet the growing demand for OPC UA, i-GuSystem integrated Prosys OPC UA Forge as a future-proof layer. Forge enables direct OPC UA connectivity with output in XML, ensuring full compatibility with iguXMLsync and downstream systems like VisualFactory, MES, Azure cloud, and Power BI.
The first Forge deployment was completed in just two hours, delivering reliable results and proving the scalability of i-GuSystem’s solutions. By adopting Forge, i-GuSystem has seamlessly extended its CNC data expertise into the OPC UA era, future-proofing its architecture while continuing to provide rapid, hands-on results for its customers.

Prosys Sentrol OPC UA & Classic SDK for Delphi 7.8.4 Released

July 1, 2025 No Comments

This is a new minor release of Prosys Sentrol. It improves minor details of the OPC UA server implementation.

Prosys OPC UA Forge 1.4 Released

June 5, 2025 No Comments

Prosys OPC UA Forge 1.4 is here, bringing powerful new features like Web of Things connectivity and an HTTP client, all shaped by real-world user feedback.

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