On May 7, 2019, Binance's hot wallet private keys were compromised, resulting in theft of 7,000 bitcoin (~$40 million). The exchange halted transactions for one week and reimbursed all affected customers from its insurance fund.

Binance has discovered a large scale security breach today, May 7, 2019 at 17:15:24 (UTC). Hackers were able to obtain a large number of user API keys, 2FA codes, and potentially other info. The hackers used a variety of techniques, including phishing, viruses and other attacks. And the hackers were able to withdraw 7000 BTC. Link: https://binance.zendesk.com/hc/en-us/articles/360028031711-Binance-Security-Breach-Update