The company is not disclosing any of its customers’ personal information.
It said that if any of them were targeted, Cerberus would be working with law enforcement to investigate.
In a statement on Wednesday, Cerberus said it was working with the FBI to determine who was responsible for the attack.
The company said the company’s security doors were “unlikely to be capable of preventing the intrusion.”
It said it has “received a number of complaints” regarding the security doors’ ability to withstand attacks and would be “reviewing the matter.”