More than 24-million customers woke up to the news that their passwords had been reset this morning. And it's all because hackers managed to access the company's database and steal personal information.

Company officials say the hackers may have gotten customer names, email and billing addresses, phone numbers and even the last four digits of customer's credit cards.

Sources say that because only the last four digits of the credit cards were taken, there is no threat to Zappos' customers.

Still, to be on the safe side, Zappos reset those customer passwords.

Investigators believe the breach in security came through one of the company's servers in Kentucky.

Zappos CEO Tony Heish sent out a company-wide email following security breach. The database that stores critical credit card information and other payment data of customers was not compromised.