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Equifax data breach: what you need to know

By Bill Brenner, Sophos

September 8, 2017

To understand how bad the data breach at Equifax is, consider this: the US has a population of approximately 324m people. The credit services provider says its breach may have affected up to 143m Americans: nearly half the population is potentially involved.

The company said in a statement that cybercriminals “exploited a US website application vulnerability” to access certain files:

Based on the company’s investigation, the unauthorized access occurred from mid-May through July 2017. The company has found no evidence of unauthorized activity on Equifax’s core consumer or commercial credit reporting databases.

What kinds of customer data did the culprits access? Names, Social Security numbers, birth dates, addresses and, in some instances, driver’s license numbers, according to Equifax chairman and CEO Richard Smith. In addition, he said, credit card numbers for approximately 209,000 US consumers and certain dispute documents with personal identifying information for approximately 182,000 US consumers were accessed.

And there’s more. Smith said:

As part of its investigation of this application vulnerability, Equifax also identified unauthorized access to limited personal information for certain UK and Canadian residents. Equifax will work with UK and Canadian regulators to determine appropriate next steps.

Many questions

There are a lot of questions surrounding this breach. Bloomberg reports that three Equifax senior executives sold shares worth almost $1.8m in the days after the company discovered the breach – but before Thursday’s disclosure. That’s bound to fuel anger from customers who will want to know why.

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