Yahoo recently discovered a huge cyber attack that took place in 2014.

The Yahoo data breach has given prospective buyers Verizon cause for concern, potentially putting the $4.8bn acquisition at risk.

At a roundtable, Verizon s general counsel Craig Silliman said that it was reasonable for Verizon to believe that the impact of the breach was material .

This references specific legal language in the deal that says Verizon can withdraw if an event occurs which reasonably can be expected to have a material adverse effect on the business, assets, properties, results of operation or financial condition of the business.

Silliman said that the results of Yahoo s investigation would determine how big the impact was, with the onus on Yahoo to demonstrate that it was not material .

The massive data breach targeting Yahoo reportedly affected 500 million accounts.

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