Fortinet FortiOS 7.6 Achieves IEC 62443-4-2 SL4 Certification

FortiOS 7.6 reaches the highest component security level defined by the IEC 62443-4-2 industrial cybersecurity standard.

Operators of critical infrastructure, manufacturing plants, energy grids and transportation networks face a growing wave of targeted attacks against Operational Technology (OT) environments. Regulators and boards now demand independent proof that the network and security components deployed in these environments meet the strictest requirements. IEC 62443-4-2 Security Level 4 (SL4) is the highest component-level assurance defined by the international standard for industrial automation and control systems, addressing attackers with sophisticated means, extended resources and specific ICS knowledge.

What was announced

Fortinet announced that FortiOS 7.6 has achieved IEC 62443-4-2 Security Level 4 certification. This makes FortiOS one of the very few network security operating systems independently certified to the highest component security level of the standard, covering FortiGate Next-Generation Firewalls used to segment and protect industrial control systems, SCADA networks and mission-critical OT assets.

The certification confirms that FortiOS 7.6 satisfies all seven foundational requirements of IEC 62443 — identification and authentication control, use control, system integrity, data confidentiality, restricted data flow, timely response to events, and resource availability — up to SL4 rigor, including protection against attackers with extended resources and ICS-specific skills.

Why this matters

For CIOs, CISOs, OT security leads and procurement teams, IEC 62443-4-2 SL4 certification removes a major evaluation burden. Instead of relying on vendor self-attestation, organizations can point to an independently verified control that maps directly to NIS2, the EU Cyber Resilience Act, national critical infrastructure regulations and internal risk frameworks.

It also simplifies architecture decisions. A single FortiOS-based platform can now be used to enforce zone-and-conduit segmentation, deep OT protocol inspection, secure remote access and integrated threat prevention — while satisfying the highest component-level assurance for industrial environments. This reduces the number of point products, shortens audits and lowers total cost of ownership.

SL4 certification of FortiOS raises the baseline for what critical infrastructure operators should expect from their cybersecurity vendors

Technical details

• Standard: IEC 62443-4-2, the international benchmark for component security in industrial automation and control systems
• Assurance level: Security Level 4 (SL4), highest defined level, targeting attackers with extended resources and ICS-specific knowledge
• Certified product: FortiOS 7.6, the operating system powering FortiGate NGFW appliances
• Coverage: All seven foundational requirements of IEC 62443, from authentication to resource availability
• Use cases: OT network segmentation, secure remote access, SCADA and ICS protocol inspection, converged IT/OT SOC integration
• Ecosystem fit: Integrates with the Fortinet Security Fabric, FortiAnalyzer, FortiManager and OT-specific services

Softprom and Fortinet

Softprom is the official distributor of Fortinet. Our team helps enterprises and critical infrastructure operators design, deploy and operate Fortinet OT and IT security architectures, from FortiGate segmentation projects to full Security Fabric rollouts with 24/7 support.

This content was prepared as part of the Softprom DistriFlow project — an automated system for monitoring and adapting vendor news. Original source: original article.