What is a primary security concern with OPC servers?

The primary security concern with OPC (OLE for Process Control) servers lies in their potential to act as a bridge for attackers between different systems. OPC servers are designed to facilitate communication between various industrial control systems by providing a standardized way to transfer data and commands. This makes them critical components within industrial environments, but it also means they can be targets for malicious actors.

When an OPC server is compromised, attackers may gain access to sensitive data or even control of connected devices. Due to the interoperability of OPC with numerous systems, including legacy systems and modern IT assets, a breach can allow attackers to move laterally across networks, accessing wider areas of an organization's infrastructure. This bridging capability poses a significant risk, as it can lead to extensive network exposure and the potential for larger-scale attacks.

In contrast, the other options misrepresent the nature of OPC servers' security implications. They do not inherently isolate systems from attacks, nor are they immune to vulnerabilities often linked to DCOM (Distributed Component Object Model), which is commonly used in OPC environments. While encryption can enhance security, it is not a feature that all OPC servers utilize by default, and the mere existence of an OPC server does not guarantee improved security. Thus, recognizing the vulnerability of these servers as potential condu