On Tuesday, it came to light that malicious files were present on a number of SIDN websites – files that should not have been there. In order to prevent abuse, SIDN immediately took a number of precautionary measures: the DRS web application was shut down and zone file publication was temporarily suspended. As a result of our precautionary action, some areas of the website that registrars use to download registrarship-related data have been unavailable since Tuesday evening. We believe that the attack began with an SQL injection on the website www.de25jaarvan.nl. That site is therefore inaccessible for the time being. The precise nature of the vulnerability is currently being investigated. Further information about the security alert will continue to be made available on the site you are now viewing.