Victor Gevers from the Dutch Institute for Vulnerability Disclosure delivers a riveting exploration into the world of large-scale vulnerability disclosure, leveraging a highly effective coordinated, crowd-sourced approach. This talk dives deep into the urgent necessity for proactive vulnerability management and the enhancement of notification strategies. Gevers offers an exclusive behind-the-scenes look at the notorious 2021 Kaseya ransomware attack, where managed service providers (MSPs) and their customers fell prey to the REvil group's devastating cyber assault. With gripping insights, he reveals why such attacks could happen again and, more importantly, how they can be prevented.