Chinese hackers exploited the Heartbleed Web-security flaw to steal data on 4.5 million patients of Community Health Systems Inc., the first known breach of a company by use of the vulnerability, said a person involved in the investigation. Community Health, the second-biggest for-profit U.S. hospital chain, said Aug. 18 that thieves stole patients’ Social Security numbers, names and addresses, without revealing how the hackers got in.
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