South Korean blockchain technology firm Ozys has accused its former chief information security officer (CISO) of weakening the company's firewall settings, which allegedly led to an $81.5 million heist on the Orbit Bridge cross-chain protocol. Ozys claims the former CISO made unauthorized changes to the firewall just two days after resigning, and the changes went unnoticed until January 10. Ozys has taken legal action against the former CISO and sought a police investigation into their potential involvement in the hack, and is also reinforcing its security measures with the help of cybersecurity firm Theori and other agencies.