Please note: You can only use the form below to notify us of security vulnerabilities in our systems and networks. Forms with other content will be deleted. You will not receive a response to those. Do you have a question? Go to our service & contact page for the answer.

Thank you for reporting a possible security vulnerability in systems or networks of KPN. We will personally contact you within two business days.
Please send us the following information:

  • A detailed description of the security vulnerability
  • IP addresses, logs and screenshots
  • Instructions on how to reproduce the security vulnerability