Equifax said late Monday that an outside review determined about 2.5 million additional U.S. consumers were potentially impacted, for a revised total of 145.5 million.
The company said the review also found that just 8,000 Canadian citizens were impacted, rather than up to 100,000 Canadians, as previously announced.
Equifax was alerted to the breach by the U.S. Homeland Security Department on March 9, Smith said in the testimony, but it was not patched.
On March 15, Equifax’s information security department ran scans that should have identified any systems that were vulnerable to the software issue but did not, the testimony said.
As a result, “the vulnerability remained in an Equifax web application much longer than it should have,” Smith said. “It was this unpatched vulnerability that allowed hackers to access personal identifying information.”
In his testimony, Smith said it appears the first date hackers accessed sensitive information may have been on May 13. He said “between May 13 and July 30, there is evidence to suggest that the attacker(s) continued to access sensitive information.”
Smith said security personnel noticed suspicious activity on July 29 and disabled the web application on July 30, ending the hacking. He said he was alerted the following day, but was not aware of the scope of the stolen data.
On Aug. 2, the company alerted the FBI and retained a law firm and consulting firm to provide advice. Smith notified the board’s lead director on Aug. 22.