![]() ![]() Windows, however, provided the option to enable this hardening via registration. The first patch, dated June 8, 2021, performed hardening of the weak authentication layers in DCOM, but the option was still disabled.To minimize operational disruptions, the patch was released in phases. In 2021, Microsoft acknowledged a critical vulnerability in its DCOM protocol and announced a hardening patch to strengthen authentication between DCOM clients and servers. In 2008, Microsoft introduced the non-DCOM OPC Unified Architecture (OPC UA) protocol, but many industrial companies still use OPC DA. However, OPC DA is based on DCOM technology, which has security vulnerabilities. ![]() The OPC Data Access (OPC DA) protocol was introduced in 1995 to enable the communication of real-time data between the programmable logic controller (PLC/PLC) and the software in OT networks. ![]()
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