Pentesting & security audits to test your digital resilience
NFIR beeldmerk kleur
NFIR beeldmerk kleur


Pentesting & security audits to test your digital resilience

Discover and address weaknesses in your digital defenses through a pentest. Our ethical hackers identify vulnerabilities and provide insight into the effectiveness of your security measures, as well as potential consequences if misused.

What is the importance of performing pentesting for your organization?

The main reasons to perform a pentest are:

  1. Identify vulnerabilities and risks:
    Receive an overview of the vulnerabilities and risks present within your infrastructure and applications.
  2. Building trust:
    Customers, shareholders and other stakeholders expect their information to be secure. A pentest provides insight into how this information is handled.
  3. Comply with standards and legislation:
    Various standards and legislations such as the AVG, BIO, ENSIA and ISO, require taking appropriate security measures. A pentest helps you meet these requirements.
  4. Continuous improvement of security:
    The results of the pentest can be used to improve and optimize your information security.

Custom Pentesting

During an intake meeting, the exact scope for the pentest is determined and the environment to be examined is determined. In our intake meeting, we thoroughly go over your specific details, requirements, attack scenario and wishes. This allows us to create a customized proposal.

What we can pentest for you

It is possible to pentest the following environments. Infrastructure, Web Application, API, Mobile Application, Operational OT. If you have a different environment, please contact us to discuss options

We offer different attack scenarios

A pentest can be conducted from different perspectives, with the result depending (in part) on the chosen attack perspective. During an intake meeting, we will jointly determine the scope of the pen test and advise on how we can perform the most valuable pen test for your organization.

Black box pen testing hacker organization applications security information

Black Box pentest

In a Black Box attack scenario, minimal information is provided in advance by the client. Ethical hackers will operate as "outsiders" without inside information. Pentesters use various techniques, including Open Source Intelligence (OSINT) to discover vulnerabilities.

Grey box pen testing risk hackers automated network penetration test the netherlands

Grey Box Pentest

A Grey Box attack scenario sits between a Black and White box. There is "limited" sharing of information used to investigate an environment. The ethical hackers will use a user account to examine the infrastructure or application.

white box pentesting ethical hardware vulnerability pentester security audit computer systems

White Box Pentest

In a White Box attack scenario (also known as a Crystal box), all information is provided in advance to target vulnerabilities. Consider the information that is also requested in Grey Box pentesting. In addition, source code, log files and server access are used. In addition, the ability to set up your own test environment can be used.

From pentesting to clear reporting

After we perform the pentest carefully and according to the applicable methodology and standard, you will receive a comprehensive report from us. In it you will find all the findings and clear solutions are provided to fix the vulnerabilities. Our reports are clear, complete and reproducible for your organization. We describe the standards used, the tests performed, the tooling applied and the measures recommended.

Request a sample pentest report here to gain insight into how we report and the data we include in it.

Certified and quality-focused Ethical Hackers

Our skilled and professional ethical hackers have extensive experience, creativity and up-to-date professional knowledge. They have completed relevant training and are certified, such as OSCPOSWPOSWE, OSEP, CPTSCBBH, and eWPT. In addition, NFIR holds a CCV seal of approval for pentesting.

CyberSecurity Event Zwolle

NFIR uses reliable pentesting services, certified with the CCV Pentesting Seal of Approval. We are your Cybersecurity partner if you are looking for a down-to-earth Dutch Cybersecurity company that has years of experience in pentesting. Our certified ethical hackers identify vulnerabilities and provide concrete and actionable insights about the effectiveness of your security measures. Contact us today to put your cybersecurity under the microscope as well.

Contact us for a professional pentest

Contact us to schedule your pentest intake. Request a sample pentest report here to gain insight into how we report and the data we include in it.

Perform pentest?

NFIR classifies pentesting vulnerabilities using the Common Vulnerability Scoring System (CVSS 3.1).


A vulnerability scan uses automated scans to discover known vulnerabilities. These vulnerabilities are then reported. It is an important first step in understanding potential weaknesses within a system.
A pentest goes one step further. During a pentest, not only are vulnerabilities identified, but they are actually exploited. This demonstrates what the actual consequence may be to a system or environment when compromised. The ethical hacker will use his experience and creativity to identify all the weaknesses of an environment, giving the organization a more realistic picture of the risks they face.

Penetration test or vulnerability assessment? – Have a Pentest Performed – Contact NFIR Now

Depending on the size of the job, a careful assessment is made as to whether multiple people should be put on a pentest to reduce the length of the job. The duration of a pentest can vary depending on the environment being tested and the complexity of the attack scenarios being used. Generally, a pentest covers a period of 2 to 4 weeks. This period includes not only the execution of the test itself, but also the preparation, analysis and explanation of the final report.

A pentest (penetration test) is necessary because companies are often unaware of vulnerabilities in their network and systems. It is a controlled and authorized attempt to evaluate security through a simulated attack. The main reasons for a pentest include vulnerability identification, risk management, regulatory compliance, evaluation of new applications and changes, protection of customer data, and building trust with customers and stakeholders. Conducting regular pentests is essential to improve security and prepare for potential attacks.

  • For example, a pentest is useful to:
    Assessing your current situation for vulnerabilities.
  • Detect vulnerabilities before the release of new applications.
  • Check weaknesses after changes to infrastructure or applications.
  • Comply with corporate policies, standards and/or legislation that require periodic security assessments.
  • Test your Cybersecurity maturity against the detection methods you have implemented.

When performing a pentest, various international standards and methodologies are used to discover and classify vulnerabilities.

Some of the key standards applicable to the assignment include:

By using these standards, a pentest can be performed in a structured and thorough manner, and the results can be reported in a clear and comparable way.

Our pentesters have a large amount of experience, a lot of creativity and up-to-date expertise. The NFIR pentesters have followed relevant training courses and obtained certifications such as OSCP. In addition, they have all received chief of police approval and signed confidentiality agreements.

A Black Box pentest means that no information about the environment is shared with the pen testers beforehand. With a pentest based on the White Box principle, all information about the environment is shared in advance. If you are having a pentest performed for the first time and want to get an overall picture of your security, it is useful to have a Black Box pen test performed.


The Web Security Testing Guide (WSTG) project is the premier cybersecurity testing resource for Web application developers and security professionals. The WSTG is a comprehensive guide to testing the security of Web applications and Web services. Created through the combined efforts of cybersecurity professionals and dedicated volunteers, the WSTG provides a framework of best practices used by penetration testers and organizations around the world.


The OWASP Mobile Application Security Testing guide is a mobile app security standard and comprehensive testing guide that covers the processes, techniques and tools used during a mobile app security test, as well as a comprehensive set of test cases that allow testers to deliver consistent and complete results.

The Penetration Testing Execution Standard (PTES) consists of several main components. These cover everything about a penetration test, namely:

  1. The initial communication and reasoning behind a pentest;
  2. The information gathering and threat modelling phases, where testers work behind the scenes to gain a better understanding of the tested organisation;
  3. Vulnerability assessment, exploitation and post-exploitation, which addresses the technical security expertise of the testers and combines it with the business insight of the assignment;
  4. Reporting, which captures the entire process in a way that makes sense to the customer and provides them with the most value.

The Common Vulnerability Scoring System (CVSS) standard provides an open framework for disclosing the characteristics and consequences of software and hardware security vulnerabilities. The quantitative model is designed to ensure consistent and accurate measurement while allowing users to see the underlying vulnerability characteristics used to generate the scores.