CSCS is affected too. My guess is that a 0-day in SSH was found. https://status.cscs.ch/incidents/bccc3321-03ca-4030-89b1-472...

ranger_dangeran hour ago
Could also be https://nebusec.ai/research/ionstack-part-2/
- denysvitalian hour ago
  Yes, but that wouldn't explain why they still allow JupyterHub's access (?)