CyCon 2021's central theme is Going Viral. It alludes to the implications of human crises (such as the 2020 pandemic) for cybersecurity and cyberspace. At a more abstract level, it aims to encourage discussions on the impact of fast proliferation and high unpredictability in cyberspace. Whether they concern old threats such as malware or new trends affecting cyberspace such as information campaigns, these phenomena have major real-life implications. We need to acknowledge those, study them and strive to use them for our common benefit.