Deep Dive - CRA Requirement (3) Security Testing

The third vulnerability-handling requirement under the EU Cyber Resilience Act (CRA) makes it mandatory for manufacturers to apply effective and regular tests and reviews of the security of their products with digital elements.

“(3) apply effective and regular tests and reviews of the security of the product with digital elements;”

This requirement pushes manufacturers beyond reactive fixes. It obliges them to implement structured, recurring testing processes that validate the security of their products at every stage, from development and integration to deployment and maintenance. Regular testing is no longer optional; it is a regulatory expectation designed to catch vulnerabilities early, minimize risk exposure, and build confidence in product resilience.

What this requirement means

Product security is much like maintaining a car. A vehicle may leave the factory in perfect condition, but as roads change, hazards evolve, and components wear down, it requires regular inspections to remain safe. Without them, small issues can turn into serious accidents. Digital products follow the same logic: they may be secure at launch, but without ongoing checks, vulnerabilities can accumulate and be exploited.

This requirement obliges manufacturers to conduct ongoing security testing rather than relying on a one-time evaluation. Products must be regularly reassessed throughout their lifecycle to confirm they remain resilient against evolving technologies, emerging threats, and changes introduced through updates. The type and frequency of these tests should be based on the product’s risk assessment, since different devices, such as consumer IoT products or industrial controllers, face different attack surfaces and require tailored testing approaches. These security testing activities should be scheduled, documented, and updated over time to ensure testing stays effective and proportionate to the product’s intended use and risk exposure.

Relevant Standards and Guidelines

Although the CRA does not prescribe specific standards, several frameworks can help manufacturers comply with the requirement for effective and regular security testing:

• ISO/IEC 27001 provides a high-level framework for information security management, including requirements for risk-based testing and periodic reviews, though it does not specify testing methodologies or CI/CD practices.

• ISO/IEC 27002 offers detailed guidance on implementing security controls, covering vulnerability management and risk assessments, but lacks depth on continuous testing procedures.

• ISO/IEC TS 27034-5-1 focuses on application security and outlines how to embed security testing into the software development lifecycle. However, it is less comprehensive for non-software elements such as hardware or infrastructure.

• ISO/IEC 27005 addresses information security risk management, including continuous monitoring and review of risks, but does not define testing methods or automation techniques.

Each of these standards contributes valuable guidance, but none alone fully address the CRA’s expectation of effective, continuous, and lifecycle-wide testing. Manufacturers therefore need to combine these standards with modern practices like DevSecOps, automated testing pipelines, and regular vulnerability assessments to ensure compliance and resilience.

How to approach Implementation

To implement this requirement, manufacturers should integrate automated security testing directly into their development and release workflows. Vulnerability scanning, static application security testing (SAST), dynamic testing (DAST), and software composition analysis (SCA) can be run automatically in the CI/CD pipeline on every build or at least on every release. This ensures that known vulnerabilities and insecure coding patterns are identified early and consistently.

Automation should be complemented by expert-driven testing to uncover design-level and logic flaws. Penetration testing, fuzzing, and architecture or code reviews should be carried out at scheduled intervals, for example regular penetration tests for actively developed products and targeted reviews whenever major features or architectural changes are introduced. For higher-risk products, annual red-team style exercises or independent security assessments are recommended to simulate advanced attack scenarios.

Testing frequency should follow a risk-based model, with safety-critical or highly connected products subject to more frequent and thorough testing. All activities must be documented, and results tracked until remediation is complete. A practical best practice is to maintain a testing calendar that combines continuous automated scans, regular penetration tests, and yearly deep assessments, ensuring regular coverage and demonstrable compliance with evolving threat landscapes.

Strategic Considerations beyond Compliance

Meeting this requirement is more than just a compliance exercise, it signals a cultural shift in how organizations approach security testing. Traditionally, testing was treated as a one-off step at the end of development, often creating bottlenecks, delaying releases, and resulting in expensive rework when vulnerabilities surfaced late.

The CRA changes this mindset by positioning testing as a continuous, integrated practice. By embedding security testing according to the risk assessment, manufacturers ensure that security validation happens at every stage, from design through deployment. This approach transforms testing from a last-minute hurdle into an enabler of product quality and resilience.

Strategically, organizations that adopt continuous testing gain clear advantages: faster time-to-market through earlier detection of flaws, lower remediation costs by fixing vulnerabilities before release, and stronger trust with regulators, customers, and partners who expect evidence of ongoing security assurance.

In our next post, we will explore Requirement (4): Notification for Security Updates &Vulnerability Disclosure, which defines how manufacturers must inform users about security patches and establish clear channels to receive, manage, and act on vulnerability reports from researchers, CERTs, and other trusted sources.

Previous Blog CRA Vulnerability Handling Requirement (2): https://tributech.io/blog/cra-vulnerability-handling-requirement-2-risk-management-security-updates Next Blog CRA Vulnerability Handling Requirement (4): https://www.tributech.io/blog/cra-vulnerability-handling-requirement-4-notification-security-updates-disclosure