Your CAF 4.0 Action Plan: Secure Critical Infrastructure and Protect Against Modern Threats

The CAF (Cyber Assessment Framework) is the UK’s national model for assessing how organizations that deliver essential services manage cyber risk and resilience. Released by the UK NCSC (National Cyber Security Centre) in 2025, CAF 4.0 raises expectations by replacing checklist reviews with measurable, outcome-based resilience for critical infrastructure.

• Secure software development and lifecycle management across internal and supplier systems (A4.b)
• AI and automation risk controls to prevent unsafe or unintended system actions
• Proactive threat hunting as a mandatory capability under Principle C2
• Supply-chain assurance and subcontractor visibility
• Sector overlays for tailored application across energy, health, transport, and digital infrastructure
• Explicit emphasis on understanding threats (A2.b) and validating security through IGPs (Indicators of Good Practice)

CAF 4.0, developed by the NCSC, moves beyond checklist compliance toward measurable outcomes and continuous improvement. It introduces new principles such as Threat Hunting (C2) and Secure Software Development (A4.b), supported by sector-specific overlays.

• Outcome-based evidence replaces control lists, giving organizations flexibility in meeting each principle
• IGPs guide expert judgment rather than rigid scoring
• New principles for threat hunting (C2) and secure software development (A4.b)
• Supports sector-specific overlays let regulators adapt expectations to each industry
• Stronger focus on governance and assurance, requiring board-level ownership

CAF 4.0 recognizes that AI-driven automation and complex software supply chains create new risks that can disrupt essential services if development and management are not secure.

• Apply secure development practices such as code provenance tracking, testing, and vulnerability management throughout the software lifecycle
• Assess and control risks from AI-driven or automated decision systems that could act unpredictably or be manipulated by attackers
• Verify the authenticity and integrity of software and updates through supplier assurance processes that enforce secure-development standards

CAF 4.0 introduces sector-specific CAF profiles, or overlays, to make the framework practical for industries that deliver essential services. Developed under the NCSC’s guidance, these overlays ensure the CAF remains a shared national framework while allowing for sector-specific interpretation.

Think of the overlays as tailored blueprints that adapt the same framework to each sector’s operational realities where each one adapts CAF outcomes to the specific risks, technologies, and regulatory expectations of its sector.

• Sector-specific interpretation: Ensure energy, healthcare, transport, and digital infrastructure operators can apply CAF principles within their operational context 
• Regulatory alignment: Allow regulators to define resilience targets that reflect real-world operational conditions 
• Leadership focus: Help security leaders concentrate on the outcomes most critical to their essential functions 
• Consistent measurement: Support uniform assessment of cyber maturity across IT and OT environments

OPSWAT solutions align with CAF 4.0 outcomes, turning framework objectives into measurable operational controls across IT and OT environments.

• Threat prevention and detection aligned with CAF Objectives B (Protecting against cyberattack) and C (Detecting cybersecurity events), supported by MetaDefender Core™ and MetaDefender Aether™ for C2 Threat Hunting through machine-learning and behavioral analysis
• Secure development verification through SBOM generation and vulnerability scanning within MetaDefender Core provide measurable assurance for software integrity
• Automated reports provide visibility and audit readiness
• Cross-domain secure file exchange between isolated networks helps protect data flows

With CAF-aligned compliance mapping, OPSWAT helps your security team move beyond checklist compliance to achieve continuous assurance and measurable resilience. The table below shows how OPSWAT’s technologies map to CAF objectives, helping organizations demonstrate measurable, evidence-based compliance.

You can simplify CAF 4.0 reporting with OPSWAT's automated evidence collection, centralized compliance views, and real-time mapping of data points to CAF objectives. These CAF 4.0 practices are already reflected in OPSWAT deployments across critical-infrastructure environments.

• SBOM generation and vulnerability detection provide direct evidence of secure-development practices under CAF A4.b, linking technical proof to specific OPSWAT products and outcomes.
• Audit reports from MetaDefender Core and MetaDefender Managed File Transfer™ map to CAF Objectives A and D, giving CISOs traceable, regulator-ready summaries that demonstrate compliance progress
  

CAF 4.0 calls for unified security controls across IT and OT systems supporting essential functions. OPSWAT’s unified platform protects data flows, devices, and networks wherever they intersect. This approach supports the CAF’s sector overlays for energy, transport, and digital infrastructure, where regulatory expectations increasingly require unified visibility across IT and OT systems.

While some vendors focus narrowly on OT visibility or IT-based monitoring, OPSWAT’s CAF-aligned platform protects both domains under a single security and compliance model.

• Integrated protection for IT and OT systems 


Combines technologies such as MetaDefender Core, MetaDefender Managed File Transfer, MetaDefender Drive™, and MetaDefender Kiosk™ to secure file exchanges and endpoints across connected and air-gapped environments

• Secure, policy-based file transfer 


MetaDefender Managed File Transfer automates file movement between networks using workflow rules, approval processes, and audit logs to maintain compliance and data integrity

• Device assurance with pre-boot Multiscanning 


MetaDefender Drive performs bare-metal Multiscanning and File-Based Vulnerability Assessment before endpoints connect to networks, helping prevent the spread of malware

• Media sanitization for removable media 


MetaDefender Kiosk uses Proactive DLP™ and secure-erase options to validate and sanitize removable media before entry into secure environments

• Centralized visibility and reporting 


MetaDefender Core, Managed File Transfer, and My OPSWAT™ Central Management provide unified dashboards, SIEM integrations, and audit logs that show device, user, and file activity across managed environments

OPSWAT detects hidden threats and validates AI-driven software behavior through MetaDefender Aether, MetaDefender Threat Intelligence™, and MetaDefender Core, fulfilling CAF 4.0 Objectives C2 and B4.a within the
NCSC’s Cyber Assessment Framework 4.0.

• Metascan™ Multiscanning and Real-time threat intelligence: uncover advanced and zero-day threats across file exchanges and devices
• Sandbox analysis: detects malicious behavior even without known indicators, correlating results through MITRE ATT&CK (Adversarial Tactics, Techniques, and Common Knowledge) mapping for structured evidence
• AI-assisted analysis: validates automated decisions and flags anomalies in system behavior
• Continuous updates to these technologies: align with evolving CAF 4.0 expectations

Together, these capabilities deliver high detection accuracy against both known and emerging threats while providing verifiable evidence for CAF assessments.

The table below summarizes how OPSWAT’s technologies align with the Cyber Assessment Framework (CAF) 4.0 objectives and principles, demonstrating how each product contributes to measurable, evidence-driven compliance across IT and OT environments.

You might find CAF 4.0 complex because it’s built on outcome-based structure that overlaps with other regulations like NIS2 and the UK Resilience Bill. As a security leader, you can reduce complexity by using integrated compliance tools that automate evidence collection and reporting, minimizing manual effort while maintaining alignment with evolving regulations.

1. Interpret outcomes through sector overlays rather than rigid controls
2. Standardize evidence collection with automated, verifiable data
3. Use unified reporting to consolidate CAF, NIS2, and Resilience Bill requirements

This approach streamlines multi-framework compliance, maintains real-time visibility across CAF objectives, and helps you demonstrate measurable progress with less administrative overhead.

CISOs can prepare effectively by focusing on readiness, evidence collection, and cross-regulatory alignment. The goal is to make CAF assessments predictable, not reactive, through scope identification, gap analysis, and automated evidence collection aligned to Objectives A–D.

1. Identify essential functions that fall under CAF scope and map them to the four core objectives
2. Conduct a gap analysis using the updated IGPs to prioritize high-impact areas
3. Align security controls with NIS2 and the UK Resilience Bill to avoid redundant audits and overlapping obligations
4. Automate data collection early through integrated compliance reporting and policy mapping to track control maturity in real time
5. Establish clear accountability at the board level to maintain continuous visibility between assessments

Outcome: A readiness model that replaces manual preparation with continuous assurance and evidence-based governance.

By collecting evidence efficiently, you can turn CAF audits from one-off exercises into continuous assurance. Standardized templates and automated reporting help your organization track outcomes in real time and maintain consistent, verifiable proof of compliance.

1. Use CAF-specific templates and automated data collection to link each control to measurable outcomes
2. Centralize evidence within integrated compliance views to monitor progress against CAF objectives in real time
3. Generate concise, auditor-ready summaries directly from automated reports to reduce preparation time and errors

CAF 4.0 requires measurable, system-generated evidence that links every control to an outcome across Objectives A–D. It’s not enough to show that controls exist. They must operate effectively and consistently over time. OPSWAT simplifies this process with automated data collection and customizable reporting that deliver both technical proof and executive-level summaries.

1. Policy and governance documentation: risk registers, security policies, incident response plans, and supplier assurance records
2. Operational and technical data: system logs, configuration files, vulnerability assessments, and file-scanning reports from live environments
3. Assurance outputs: internal audit findings, test results, and maturity reviews aligned with the Indicators of Good Practice (IGPs)

NCSC guidance emphasizes that evidence must demonstrate continuous operation, not point-in-time compliance. OPSWAT’s integrated log collection, audit trails, and verification reports ensure each CAF control can be validated with system-generated data rather than manual records.

Spreadsheet mapping links each CAF outcome to specific technical controls, showing where evidence is complete, partial, or missing. It provides instant visibility into compliance maturity and highlights actionable next steps.

You can link CAF outcomes to OPSWAT’s integrated reporting dashboards and audit data to track control status in real time. In pilot deployments with critical infrastructure operators, this approach has reduced manual reporting effort by more than 50% while improving audit readiness.

You’ll face distinct operational risks depending on your sector, which is why CAF 4.0 includes tailored guidance to show how outcomes apply in your environment. These adaptations help organizations adopt controls more efficiently and align them with real-world operations. OPSWAT supports this with automated reporting and modular product configurations that can be adapted to different operational environments.

CAF priorities differ across industries, but all share the same goal of safeguarding essential services. The right combination of targeted guidance and automation accelerates CAF 4.0 adoption while ensuring controls remain proportionate and measurable across industries.

Organizations can use OPSWAT’s configurable dashboards and reporting features to align their controls with sector-specific CAF outcomes. These tools provide real-time visibility into control status across environments, helping teams apply consistent standards and streamline onboarding as they adopt CAF 4.0 practices.

When resources are limited, focus on the controls that will give you the greatest reduction in operational risk. Automation and continuous intelligence act as force multipliers, allowing smaller teams to achieve the same level of CAF 4.0 assurance as larger organizations.

1. Start with high-impact objectives such as B3 (Data Security) and C2 (Threat Hunting)
2. Use automated evidence collection to replace manual processes and free analyst time
3. Prioritize continuous threat detection and secure development controls that protect core assets first
4. Use integrated reporting dashboards to monitor control effectiveness and flag gaps automatically

CAF 4.0 positions compliance as your strategic enabler by aligning your security performance with measurable business outcomes. It enables organizations to quantify cyber maturity, demonstrate continuous assurance, and prioritize investments that directly strengthen resilience. OPSWAT’s automated data collection and reporting link operational data to measurable security outcomes. This gives you clear visibility into how every control supports mission continuity.

Real-time intelligence ensures that CAF 4.0 compliance evolves alongside the threat landscape. OPSWAT’s platforms automatically update malware engines and threat feeds from zero-day exploits to AI-driven attacks. This constant update cycle keeps assessments accurate and ensures that regulatory evidence reflects the organization’s true security posture at any given time.

When you’re navigating CAF 4.0 compliance and sector-specific mandates, OPSWAT helps you protect every file, device, and data flow through trusted threat prevention and compliance automation technologies.

Connect with an OPSWAT expert to accelerate your CAF 4.0 readiness.