33 Zero-Day Vulnerabilities in Four Widely Used Open Source TCP/IP Stacks

How did no one discover this until now? 

AMNESIA:33, these vulnerabilities reside in the uIP, FNET, picoTCP and Nut/Net stacks, which serve as foundational connectivity components for millions of IoT, OT, networking and IT devices. Four of these vulnerabilities are critical and allow for remote code execution.