The Cybersecurity and Infrastructure Security Agency (CISA) and the U.K. National Cyber Security Centre (NCSC) have partnered with the U.S. Federal Bureau of Investigation (FBI) and numerous international cybersecurity organizations to release guidance on securely connecting into operational technology (OT) networks.

Secure Connectivity Principles for Operational Technology (OT) presents eight principles to use as a framework to design, secure, and manage connectivity into OT environments: covering risk assessment, exposure management, network standardization, secure protocols, boundary hardening, compromise limitation, logging and monitoring, and isolation planning.

The guidance addresses challenges that many organizations face in prioritizing cybersecurity due to operational constraints, dependence on legacy technologies, and increasing use of third-party vendors and remote access solutions. The guidance emphasizes that exposed and insecure OT connectivity is known to be targeted by both opportunistic and highly capable actors, including state-sponsored actors actively targeting critical national infrastructure (CNI) networks.

Impacts and Implications of OT Cybersecurity

Legacy System Modernization and Risk Management

The document identifies obsolete products as a critical vulnerability, noting that OT networks frequently contain obsolete products attributable to extended system lifecycles, and these products no longer receive security updates, lack latest security mitigations, and require unmanageable compensating controls. Organizations must invest in maintaining specialized knowledge and technical skills, either through in-house expertise or external contractors, while obsolete products should be treated as untrusted and should not be used to implement security controls. The guidance states that organizations should view segmentation and network controls as temporary measures while establishing a timeline for asset replacement, creating significant pressure on federal agencies to modernize their industrial control systems. This modernization imperative will require comprehensive risk management frameworks and threat modelling capabilities that enable organizations to evaluate how technical controls can mitigate connectivity-related risks.

Network Segmentation and Boundary Protection

The guidance emphasizes that the prevalence of obsolete assets and weak security controls within the OT environment makes hardening the OT boundary critical, with network segmentation and segregation remaining key controls to reduce exposure. It states that organizations should invest in modern, modular, and easily replaceable boundary assets, including deploying a firewall with application-layer (Layer 7) inspection capabilities, often referred to as a next-generation firewall. The document introduces micro-segmentation as offering a more granular approach by dividing zones into smaller units based on specific workloads, applications, or device functions, allowing organizations to restrict communication paths to only what is strictly necessary. Federal agencies will need to implement dynamic network control mechanisms that provide intelligent, context-aware enforcement of traffic policies, including stateful filtering and deep packet inspection (DPI) to analyze full payload of network packets and interpret protocol-specific commands.

Supply Chain Security and Third-Party Access Management

The document emphasizes that the supply chain plays a critical role in OT security, with a wide range of third parties often involved in the design, integration, and ongoing maintenance of systems. It identifies specific supply chain factors affecting secure connectivity implementation: ability to influence security controls, contractual controls for minimum product security requirements, component visibility, supplier trustworthiness, and supplier track-record in responding to security issues. The guidance states that when third parties require access through remote connectivity, flexibility should be embedded within contractual agreements to accommodate evolving security requirements, and organizations should establish ongoing processes to automate exposure management within their organization. This creates demand for supply chain risk management solutions and secure remote access architectures that enable organizations to centralize third-party connectivity through secure solutions hosted in demilitarized zones (DMZ), ensuring consistent enforcement of access controls and session monitoring.

Potential OT Cybersecurity Contract Opportunities

Comprehensive OT Security Architecture and Implementation Services

Federal contractors can capitalize on the need for end-to-end secure connectivity solutions that address multiple principles simultaneously, including designing and implementing cross domain solutions that represent a collection of security controls to enable specific data flows with hardware security controls at key boundaries. The guidance emphasizes centralizing and standardizing connectivity to consolidate access points and enforce uniform security controls, creating opportunities for contractors to deliver integrated solutions combining next-generation firewalls with application-layer inspection, data diodes for physically enforced uni-directional data flows, and secure gateways with brokered connections through DMZ segments. Contractors can offer turnkey solutions that implement micro-segmentation with targeted traffic policies down to individual devices, establish just-in-time access models, deploy privileged access workstations (PAW) for administration, and integrate threat detection systems (IDS/IPS) at critical network boundaries, while ensuring all implementations align with the principle of “browse down” where administration devices are trusted as much as or more than the systems being managed.

Protocol Migration and Secure Communications Modernization

Following this framework may create substantial opportunity for contractors specializing in industrial protocol security by requiring organizations to default to the latest secure versions of industrial protocols (DNP3 to DNP3-SAv5, CIP to CIP Security, Modbus to Modbus Security, OPC DA to OPC UA). Federal agencies need assistance establishing roadmaps for migration to secure industrial protocol variants and implementing crypto agility to enable switching and updating cryptographic algorithms, ensuring the lifetime of the product is matched by the lifetime of the cryptographic algorithm. Contractors can provide services to restrict industrial control protocols to isolated OT network segments while establishing secure, standardized protocols designed for interoperability (such as OPC UA over TLS, MQTT over TLS, HTTPS) for external connections between OT and IT through DMZ-based historians with unidirectional secure transfer mechanisms. This includes implementing schemas to inspect and verify protocols and data payloads at key trust boundaries, deploying validation that is schema-based and follows a 'known good' model, and ensuring protocols support cryptographic protections for authenticity and integrity including migration pathways to post-quantum cryptography algorithms.

Monitoring, Logging, and Incident Response Infrastructure

The guidance's emphasis that monitoring is your last line of defense when designing secure connectivity creates significant demand for comprehensive security operations capabilities tailored to OT environments. Contractors can deliver solutions that implement logging throughout OT environments to establish baselines of normal activity, design monitoring and alerting rules that identify how attackers may seek to exploit systems through identifying weak points, and deploy anomaly detection specifically advantageous in OT systems where there are relatively static, repetitive processes with consistent command structures. Opportunities include implementing continuous monitoring of data flows within and between network segments to validate segmentation policies, deploying external attack surface management (EASM) tools to identify accidental or unmanaged exposure before attackers do, and establishing processes for continual monitoring that scan full public IPv4 and IPv6 ranges belonging to organizations. Additionally, contractors can develop isolation plans linked to wider business continuity plans, including site-specific isolation strategies, application/service-specific isolation capabilities, and site isolation with hardware-enforced trusted communications that use data diodes to transfer telemetry and logging while isolating other data flows during security incidents.

Competitive Positioning for OT Cybersecurity Opportunities

There are several ways a company may successfully compete for opportunities in these areas. For example, contractors who are well equipped and have a track record as integrated solution providers capable of delivering comprehensive OT security architectures will hold a competitive advantage over those that solely offer point solutions, at least from a prime contracting perspective.

Those who can demonstrate proven experience implementing layered defense strategies that balance operational continuity with security requirements may also be well positioned for success. Finally, providers offering turnkey solutions with clear documentation, contractual flexibility for evolving security needs, and ongoing support – including monitoring, incident response, and asset lifecycle management – may also find growth opportunities.