The attacker manipulated price feeds in order to create and profit from an under collateralized loan.
Source: https://www.coindesk.com/defi-project-bzx-exploited-for-second-time-in-a-week-loses-630k-in-ether
DeFi Project bZx Exploited for Second Time in a Week, Loses $630K in Ether
February 18, 2020
CoinDesk
