Used-vehicle sales at AutoNation in June “were flat or accelerating” and the retailer’s business lines in general were “moving positively,” said Mike Manley, AutoNation’s CEO.

Then came June 19 and a cyber-attack against dealership management software provider, CDK Global. The negative impact on virtually every business segment at AutoNation, including its used vehicle operations, was swift.

The main functionality of CDK’s system was ...

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