Cheng-Da Tsai, aka Orange Tsai, is the principal security researcher of DEVCORE and the core member of CHROOT security group in Taiwan. He is also the champion and got the "Master of Pwn" title in Pwn2Own 2021. In addition, Orange has spoken at several top conferences such as Black Hat USA/ASIA, DEF CON, HITCON, HITB GSEC/AMS, CODE BLUE, POC, and WooYun! Currently, Orange is a 0day researcher focusing on web/application security. His research got not only the Pwnie Awards winner for "Best Server-Side Bug" of 2019/2021 but also 1st place in "Top 10 Web Hacking Techniques" of 2017/2018. Orange also enjoys bug bounties in his free time. He is enthusiastic about the RCE bugs and uncovered RCEs in numerous vendors such as Twitter, Facebook, Uber, Apple, GitHub, Amazon, etc. You can find him on Twitter @orange_8361 and blog http://blog.orange.tw/