Dear RIPE Atlas users, We want to let you know about a recent issue in the RIPE Atlas system involving an open port on the latest generation (v3) probes. Due to an issue with the latest firmware release, a subset of the v3 probes were listening to incoming connections on an open port that should not have been left open. As a secondary measure, however, access to this port required credentials only available to the RIPE Atlas probe developers. It therefore never presented open access to the probes. This port (SSH) is used for development purposes in our internal development environment. We upgraded the v3 probes to a new, corrected firmware version, and improved the checks in our firmware release process. We would like to thank ZeelandNet for reporting the issue to us. We want to assure you that the security of the RIPE Atlas system is important to us. We are continually improving the controlling infrastructure as well as the probes themselves in order to prevent vulnerabilities. We apologise for this issue and want to stress that no probes were actually affected in any way. You can learn more about the security of the RIPE Atlas system on our dedicated security page at: https://atlas.ripe.net/docs/security/ Thank you for your continuing support of RIPE Atlas. Regards, Robert Kisteleki RIPE NCC