"Cryptocurrency exchanges come and go, and it's almost inevitable that an exchange will get hacked at one point or another. While cryptocurrencies themselves are very secure, exchanges can be affected by a variety of vulnerabilities, making them a prime target for malicious actors. State of the industry – February 2020: As it stands, 2019 saw a record number of twelve crypto exchanges being hacked. That being said, across the board the amounts of crypto stolen were worth less. In total, $292,665,886 worth of cryptocurrency and 510,000 user logins were stolen from crypto exchanges in 2019." -selfkey website
An exchange hack will affect the price, it all depends on what the hacker will do with all the coins that he/she has stolen. Nonetheless, the bear market is a perfect opportunity to buy some coins, specifically bitcoin and ethereum.