Security is Built With us.
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About X41

We do IT-Security

  • Our mission.


    We are experts in Application Security Testing. We enable you to make your products safe and sound.

  • Secure by Design

    Secure from the ground up.

    Great design is the base of secure products and systems. Rely on our expertise in security design.

  • Start-Up!

    Emerging companies have special needs.

    Believing in start-up-culture we care for them! We help you gaining an advantage.

  • What


What we do.




We have the expertise in code reviewing, red team penetration testing and security design reviews of a wide variety of products. Finding defects will improve the quality of your products.

Vulnerability Management


We help you handle vulnerabilities in products you use or develop. We take care of vendor contacts and work out the technical details with security researchers and developers to do vulnerability reporting in a professional way. Years of experience in uncovering vulnerabilities created an expert process in getting vulnerabilities fixed.


  • Application Security (APPSEC)
  • Mobile Security
  • Embedded Security
  • Network Security
  • Cloud Security

X41 - Security Research Lab

Serious research requires serious expertise.

Vulnerability Research


There is no defense without understanding offense. Security Research is essential to keep up with emerging threats. From uncovering new vulnerabilities to creating better mitigations we are a strongly research driven company.

Mitigation and Hardening


No application is bug-free. A good security concept will include measures to harden and mitigate yet unknown vulnerabilities making it harder for an adversary to exploit them. We develop new techniques to mitigate exploitation and contain threats.

Our recent research includes:

If you are interested in custom research contact us.


Is security your passion? Do you like being creative? Do you want to face new challenges to expand your skills even further? Contact us, we're hiring!

Contact Us

Office Locations:

Aachen Frankfurt