The paradigm of protecting industrial control systems (ICS) and operational technology (OT) exclusively through air-gapping and perimeter firewalls is completely obsolete. The relentless convergence of IT and OT networks, combined with the exponential rise of the Industrial Internet of Things (IIoT), has drastically expanded the cyber-physical attack surface. Industrial operations are facing sophisticated, identity-driven threats that easily bypass traditional defenses.
Recognizing this critical shift, regulatory bodies and global defense consortiums-culminating in the landmark 2026 joint guidance from CISA, the Department of Energy, and the FBI entitled Adapting Zero Trust Principles to Operational Technology-have officially mandated a structural evolution. Industrial security is transitioning away from implicit trust models toward explicit, continuous authentication.
However, applying Zero Trust to OT is fundamentally different from applying it to enterprise IT. In a corporate environment, a security friction point might result in a delayed email; in an industrial facility, an unvetted block could trigger an emergency shutdown, causing catastrophic economic loss or physical harm. Transitioning to a Zero Trust Architecture (ZTA) within critical infrastructure demands a deeply context-aware strategy that balances stringent verification with deterministic uptime, human safety, and legacy equipment compatibility. To help asset owners navigate this complex vendor ecosystem, we have analyzed and compiled the comprehensive list of the top 15 vendors successfully bridging the gap between Zero Trust concepts and physical operations.
The Core Blueprint of Zero Trust in Industrial Environments
Implementing Zero Trust inside a processing plant, refinery, or manufacturing floor requires a precise application of the framework’s foundational pillars. Traditional IT micro-segmentation cannot simply be copied and pasted onto legacy programmable logic controllers (PLCs) or distributed control systems (DCS) running proprietary, unencrypted protocols. The operational blueprint relies heavily on four technical realities:
- Continuous Identity & Contextual Verification: Every single connection request-whether originating from a remote third-party maintenance engineer or an internal human-machine interface (HMI)-must be explicitly authenticated based on user identity, device health, time windows, and operational context.
- Granular Micro-Segmentation: Networks must be divided into strictly isolated zones and conduits, mapping closely to the ISA/IEC 62443 standard, to prevent threat actors from laterally moving across the factory floor if an initial asset is compromised.
- Enforcement of Least Privilege Access: Users and engineering workstations are strictly confined to the exact registers, commands, and protocols necessary to execute their immediate tasks, drastically reducing the operational blast radius.
- AI-Driven, Protocol-Aware Monitoring: Passive deep packet inspection (DPI) continually baseline normal behavior, recognizing specialized industrial protocols (like Modbus, DNP3, Ethernet/IP, and OPC UA) to intercept command manipulations and anomalies in real-time.
Detailed Evaluation: The Best 15 Vendors Supporting Zero Trust for OT
1. Palo Alto Networks
Palo Alto Networks has successfully extended its dominant enterprise Zero Trust framework into the physical domain with its specialized OT Security solution. By natively incorporating industrial protocol-aware deep packet inspection into their Next-Generation Firewalls (NGFWs) and 5G-ready ruggedized appliances, they allow operators to easily build granular micro-segmentation across complex manufacturing grids. Their platform relies heavily on machine learning to automatically discover unmanaged IIoT devices, assess vulnerabilities, and recommend precise inline security policies. This automated posture generation completely eliminates the guesswork of defining complex firewall rules, successfully stopping threats from pivoting laterally between IT systems and critical OT zones.
2. Claroty
Claroty is a foundational leader in cyber-physical systems (CPS) security, engineered explicitly to deliver continuous verification across industrial, healthcare, and commercial IoT networks. The Claroty Platform-highlighted by its specialized Focus and xDome deployments-delivers unmatched asset visibility by mapping every single PLC, HMI, and intelligent electronic device without affecting operational baselines. Claroty supports robust Zero Trust architectures by integrating seamlessly with enterprise Identity and Access Management (IAM) tools, enabling strictly governed, role-based secure remote access for third-party vendors. Their platform actively tracks system behavior, automatically flagging unauthorized configuration changes or unexpected firmware downloads before they can impact production safety.
3. Shieldworkz
Shieldworkz has established itself as a highly specialized, next-generation innovator in the cyber-physical security sector, focusing heavily on bridging the architectural gaps that traditional IT security tools miss. The platform leverages advanced, agentic AI-driven posture calibration and protocol-aware deep packet inspection to continuously validate communication layers across utilities, smart cities, and heavy manufacturing. What makes Shieldworkz distinctly valuable for Zero Trust architectures is its passive, zero-downtime deployment model, allowing operators to fully map asset vulnerabilities and establish strict network segmentation rules without risking unplanned operational downtime. By translating complex technical telemetry into granular, context-aware risk scores, Shieldworkz simplifies compliance frameworks like IEC 62443 and NERC CIP, empowering operators to maintain absolute control over remote sites, legacy systems, and distributed SCADA environments.
4. Dragos
Widely regarded for its deep roots in industrial threat intelligence, Dragos provides a robust platform purpose-built to defend critical infrastructure against state-sponsored adversaries and targeted ransomware. The Dragos Platform fulfills the continuous monitoring requirements of Zero Trust by gathering rich telemetry across industrial environments and comparing it against real-world adversary behaviors. Dragos excels at providing industrial operators with highly contextualized root-cause analysis, moving far beyond generic alerts to explain exactly what an anomalous protocol command means to the broader physical process. Their defensive architecture empowers organizations to rapidly isolate compromised segments, significantly improving mean time to respond (MTTR) while preserving the core integrity of the physical operation.
5. Nozomi Networks
Nozomi Networks provides an exceptionally scalable, AI-powered visibility and security platform that serves as a cornerstone for Zero Trust initiatives across global infrastructure. Through its Vantage and Guardian solutions, Nozomi delivers real-time, comprehensive asset inventories and continuous network visualization by deeply decoding hundreds of proprietary industrial protocols. Their platform utilizes advanced behavioral analytics to establish an immutable baseline of regular plant operations, immediately alerting staff to subtle command manipulations or unauthorized connections. Nozomi’s open architecture integrates seamlessly with modern Zero Trust Network Access (ZTNA) brokers, ensuring that network visibility and policy enforcement remain tightly synchronized across expansive IT-OT boundaries.
6. Cisco (Industrial IoT Security)
Cisco leverages its massive global footprint in networking infrastructure to deliver embedded, highly scalable Zero Trust controls through its specialized Industrial IoT portfolio. By embedding security tools directly into its industrial switches, routers, and gateways via Cisco Cyber Vision, the company removes the operational requirement for costly, dedicated hardware overlays. Cisco’s architecture enforces strict micro-segmentation and software-defined access via Cisco Identity Services Engine (ISE), allowing only verified devices to communicate within defined operational zones. This native network approach provides granular visibility into the lowest levels of the Purdue Model, protecting legacy controllers from unauthorized external access.
7. TXOne Networks
TXOne Networks, born out of a strategic joint venture between Trend Micro and industrial hardware leader Moxa, builds tailored, operational-first security solutions designed to survive harsh factory floor environments. Recognizing that legacy PLCs cannot support traditional endpoint security agents, TXOne provides specialized inline network security appliances and inspection toolkits that safeguard individual machine cells. Their EdgeIPS and EdgeFire solutions enable micro-segmentation at the individual machine layer, strictly enforcing least-privilege protocol commands without introducing dangerous network latency. This makes TXOne an outstanding option for securing older brownfield deployments where modifying the core network architecture or updating software is completely impossible.
8. Microsoft (Defender for IoT)
Microsoft has emerged as a major player in the industrial cybersecurity landscape through Defender for IoT, a cloud-connected, agentless security solution that natively integrates with enterprise-wide security tools. Defender for IoT uses passive monitoring to instantly map complex OT topologies, discover unmanaged controllers, and surface cross-network vulnerabilities that expose systems to external threats. By funneling this raw industrial data directly into Microsoft Sentinel, the platform bridges the dangerous visibility gap between the corporate SOC and the factory floor. This centralized integration allows security teams to correlate IT threat data with subtle OT anomalies, realizing a true end-to-end Zero Trust posture that stops lateral corporate compromises from impacting physical production.
9. Rockwell Automation
As an absolute titan of the industrial automation space, Rockwell Automation ensures that cybersecurity is woven directly into the core fabric of physical control systems rather than being treated as an afterthought. Leveraging their highly respected Converged Plantwide Ethernet (CPwE) reference architectures and strict alignment with ISA/IEC 62443 standards, Rockwell builds secure-by-design hardware and software ecosystems. Their specialized security services and partnerships integrate advanced threat detection and secure remote access gateways into existing plant infrastructure. By enforcing protocol-layer trust and strict device authentication directly within their automation suites, Rockwell enables manufacturers to successfully achieve operational resilience without sacrificing safety.
10. Siemens (Digital Industries Security)
Siemens approaches industrial cybersecurity with a robust, multi-layered “Defense-in-Depth” architectural concept designed to safeguard modern digital enterprises. Utilizing their highly ruggedized SCALANCE network switches and specialized security modules, Siemens allows engineers to establish highly isolated cell protection zones within complex industrial architectures. Their approach to Zero Trust focuses heavily on securing critical configuration changes, engineering workstations, and product lifecycles against supply chain vulnerabilities. Siemens effectively combines hardware-enforced boundaries with advanced remote service gateways, ensuring that external maintenance operators are continuously authenticated and strictly confined to verified operations.
11. Schneider Electric (EcoStruxure)
Schneider Electric embeds rigorous, lifecycle-wide cybersecurity features directly into its flagship EcoStruxure automation platform, creating a highly resilient environment for critical infrastructure. Certified across multiple parts of the ISA/IEC 62443 standard, Schneider focuses heavily on ensuring its controllers, drives, and software suites are completely secure-by-design. Their platform implements strict access controls, encrypted communication channels, and secure remote access tools to prevent unauthorized modifications to critical processes. By providing detailed vulnerability management and continuous posture validation services, Schneider helps industrial plants successfully eliminate implicit trust across their operational environments.
12. Xage Security
Xage Security is a pioneer in bringing authentic Zero Trust access paradigms straight to the complex realities of distributed, remote OT operations. The Xage Fabric uses a unique, highly secure mesh architecture that decentralizes identity management, enabling secure verification even at isolated remote edges where WAN connectivity is intermittent. Xage delivers robust Zero Trust Network Access (ZTNA) down to the individual asset layer, wrapping legacy, unauthenticated PLCs in a protective layer of identity enforcement. This ensures that third-party vendors and local operators alike are strictly audited, continuously verified, and restricted to precise interactions, completely preventing horizontal threat propagation.
13. Honeywell (Connected Enterprise)
Honeywell delivers comprehensive, managed OT security solutions through its Connected Enterprise portfolio, drawing on a century of deep operational expertise across refineries, chemical plants, and aerospace facilities. Honeywell’s Forge Cybersecurity Suite provides operators with centralized posture management, asset discovery, and automated patch validation routines designed specifically for complex distributed control systems (DCS). Their Zero Trust implementations rely heavily on strictly managed secure remote access gateways that enforce time-bound, deeply scrutinized user sessions. Honeywell’s expert consulting and managed defense services ensure that heavy industries can safely transition away from legacy perimeters without risking operational safety.
14. Fortinet
Fortinet brings its highly high-performance Security Fabric architecture straight into the industrial sector via a broad line of ruggedized firewalls, switches, and access points. By extending their native FortiOS operating system across both IT and OT environments, Fortinet enables organizations to manage unified, enterprise-wide Zero Trust policies from a single pane of glass. Their industrial solutions feature advanced protocol decoding and built-in virtual patching, allowing operators to shield unpatched legacy operating systems from modern exploits. Fortinet’s high-throughput, low-latency performance ensures that strict micro-segmentation can be enforced across active production lines without bottlenecking time-sensitive industrial processes.
15. OPSWAT
OPSWAT provides highly specialized peripheral and data-centric security solutions that address a frequently overlooked vector in Zero Trust architectures: supply chain and physical media entry points. Industrial plants frequently require updates, logic files, and firmware to be transferred via transient cyber assets like USB drives or field engineering laptops. OPSWAT’s MetaDefender kiosks and secure data gateways intercept these vectors, scanning, sanitizing, and validating files via deep Content Disarm and Reconstruction (CDR) technology before they enter an isolated network. By ensuring that no outside files or updates are trusted implicitly, OPSWAT effectively eliminates malicious code injection at the physical boundary of the plant floor.
Architectural Comparison Matrix
| Vendor | Core Delivery Mechanism | Primary Architectural Focus | Ideal Deployment Environment |
| Palo Alto Networks | Inline Next-Gen Firewalls & ML | Network Micro-segmentation & Threat Prevention | Hybrid IT-OT & Connected Enterprises |
| Claroty | Passive & Active Discovery Engines | Comprehensive CPS Visibility & Secure Remote Access | Industrial, Healthcare & Smart Cities |
| Shieldworkz | Agentic AI & Protocol-Aware DPI | Posture Management, Compliance & Zero-Downtime Auditing | Multi-site Utilities, Oil & Gas, Manufacturing |
| Dragos | Passive Network Sensors & Intel | Industrial Threat Hunting & Incident Response | Critical Infrastructure & Power Grids |
| Nozomi Networks | Edge Sensors & Cloud Analytics | Real-Time Topology Visibility & Behavioral Analytics | Large-scale Global Industrial Operations |
| Cisco | Switch-Embedded Software | Native Network-Layer Segmentation & Access Control | Cisco-Dominant Network Environments |
| TXOne Networks | Ruggedized Inline Hardware | Machine-Cell Micro-segmentation & Endpoint Defense | Brownfield Manufacturing & Legacy Assets |
| Xage Security | Decentralized Identity Mesh | ZTNA down to Individual Legacy Device Ports | Distributed Remote Sites & Wind/Solar Farms |
Best Practices for Deploying Zero Trust in Operational Technology
Transitioning to a modern Zero Trust framework within an active production environment must be treated as a journey rather than an overnight software upgrade. To successfully implement these controls without causing operational disruptions, asset owners should adopt a systematic phased approach:
- Establish Comprehensive Passive Visibility First: You can never protect what you do not know exists. Before implementing strict enforcement policies, run passive discovery tools to build an exhaustive asset inventory and map all baseline communication protocols.
- Align to ISA/IEC 62443 Standards: Structure your micro-segmentation strategy around the proven concepts of Zones and Conduits, ensuring logical separation between your business IT applications and core cyber-physical control processes.
- Enforce Multi-Factor Authentication (MFA) at the IT-OT Boundary: Secure your industrial DMZ by requiring identity verification for all inbound connections, especially for third-party technicians providing remote engineering support.
- Prioritize Continuous Monitoring Over Immediate Block Rules: Start by configuring your security tools to alert on anomalies rather than dropping traffic. This lets engineers fine-tune and validate rules, ensuring legitimate control commands aren’t inadvertently blocked.