{"id":485,"date":"2019-11-08T11:17:54","date_gmt":"2019-11-08T11:17:54","guid":{"rendered":"http:\/\/opcconnect.integrationobjects.com\/?p=485"},"modified":"2026-03-12T13:25:12","modified_gmt":"2026-03-12T13:25:12","slug":"dcom-vulnerability-opc-alarm-systems","status":"publish","type":"post","link":"https:\/\/integrationobjects.com\/blog\/dcom-vulnerability-opc-alarm-systems\/","title":{"rendered":"Eliminate DCOM Vulnerabilities in Your Alarm Management System with OPCNet Broker & OPC Easy Archiver"},"content":{"rendered":"\r\n

Many industrial facilities still rely on OPC Classic technologies to manage alarms and events. However, these systems often expose organizations to serious DCOM vulnerabilities that affect reliability, security, and operational efficiency.<\/p>\r\n

DCOM was originally designed for local Windows communication and struggles to meet the requirements of modern industrial networks. As a result, engineers frequently face connection failures, firewall complications, and cybersecurity risks when managing OPC AE communications.<\/p>\r\n

This article explains why DCOM vulnerabilities<\/a> remain a critical issue in industrial alarm systems and how a tunneling architecture combined with secure alarm archiving can eliminate these risks while improving reliability and compliance.<\/p>\r\n

Why DCOM Vulnerabilities Persist in Industrial Alarm Systems<\/h3>\r\n

DCOM was never designed for today\u2019s segmented, security-focused industrial networks. Consequently, it introduces several DCOM vulnerabilities that impact cybersecurity, system stability, and engineering productivity.<\/p>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
\r\n

1. High cybersecurity exposure<\/strong><\/p>\r\n<\/td>\r\n

\r\n

DCOM communication requires dynamic port ranges to remain open across network segments. Unfortunately, this behavior significantly increases the attack surface of industrial systems.<\/p>\r\n

Because of this, many organizations struggle to comply with cybersecurity frameworks such as ISA\/IEC 62443 when OPC AE relies on DCOM communication.<\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

2. Complex firewall and domain rules<\/strong><\/p>\r\n<\/td>\r\n

\r\n

Another major DCOM vulnerability is the complexity of firewall configuration.<\/p>\r\n

DCOM communication relies on:<\/p>\r\n

    \r\n
  • \r\n

    Multiple open ports<\/p>\r\n<\/li>\r\n

  • \r\n

    Domain authentication<\/p>\r\n<\/li>\r\n

  • \r\n

    Bidirectional communication<\/p>\r\n<\/li>\r\n

  • \r\n

    RPC subsystem dependencies<\/p>\r\n<\/li>\r\n<\/ul>\r\n

    As a result, communication frequently fails when OPC AE servers operate across segmented networks.<\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

3. Unreliable remote OPC connections<\/strong><\/p>\r\n<\/td>\r\n

\r\n

DCOM also causes instability in distributed environments.<\/p>\r\n

Connections often break when:<\/p>\r\n

    \r\n
  • \r\n

    Network latency increases<\/p>\r\n<\/li>\r\n

  • \r\n

    Servers restart<\/p>\r\n<\/li>\r\n

  • \r\n

    VPN connections are used<\/p>\r\n<\/li>\r\n

  • \r\n

    Domain boundaries change<\/p>\r\n<\/li>\r\n<\/ul>\r\n

    When these failures occur, engineers must manually reconnect clients, which increases the risk of alarm data loss.<\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

4. No encryption for alarm and event traffic<\/strong><\/p>\r\n<\/td>\r\n

\r\n

One of the most serious DCOM vulnerabilities is the absence of native encryption.<\/p>\r\n

OPC AE communication over DCOM transmits alarm and event data in clear text unless additional security layers are implemented. Consequently, sensitive operational data may be exposed on the network.<\/p>\r\n<\/td>\r\n<\/tr>\r\n

\r\n

5. Engineering time lost in troubleshooting<\/strong><\/p>\r\n<\/td>\r\n

\r\n

DCOM misconfiguration remains one of the most common causes of OPC connectivity issues. Engineers frequently spend hours troubleshooting domain permissions, RPC dependencies, and firewall rules instead of focusing on operational improvements.<\/p>\r\n

Because of these recurring problems, many industrial organizations are now looking for DCOM-free architectures that preserve their existing OPC infrastructure while improving security and reliability.<\/p>\r\n<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n

A Modern Architecture to Eliminate DCOM Vulnerabilities<\/h2>\r\n

A widely adopted method to eliminate DCOM in industrial systems is to use a tunneling layer that replaces DCOM communication with secure, encrypted channels. This architecture also enables centralized alarm collection, consistent database logging and simpler network segmentation.<\/p>\r\n

A modern DCOM-free architecture should provide:<\/p>\r\n