Questions are swirling over who is responsible for the security flaws exploited by hackers in the world's biggest ransomware attack to date, which crippled thousands of businesses and public organizations around the world. Because hackers exploited a security hole in some Windows versions discovered by the National Security Agency, Microsoft says the intelligence agency bears some responsibility. "This attack provides yet another example of why the stockpiling of vulnerabilities by governments is such a problem," Microsoft president and general counsel Brad Smith said in a weekend blog post.



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