Sonne Finance hacked for at least $20 million

The Sonne Finance lending protocol was exploited for at least $20 million as an attacker was able to exploit a vulnerability in some of their smart contracts. Sonne is a fork of the Compound Finance project, which has known vulnerabilities that are sometimes not properly addressed by people who reuse the code — as has happened with Radiant Capital and Rari.

After being alerted to the theft by several security companies, Sonne announced they had paused the contract on the Optimism Ethereum layer-2 chain.