The central theme of CyCon 2021 - Going Viral - alludes to the implications of human crises 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. Adapting to the new reality, this year CyCon will provide a virtual meeting point for decision-makers, opinion-leaders, law and technology experts from the governments, military, academia and industry.