'WannaCry' ransomware attack spreads worldwide (update)
It exploits supposedly NSA-developed vulnerabilities on unpatched Windows systems.
NHS hospitals in England hit by a widespread cyberattack (updated)
IT systems across the country are falling victim to ransomware.
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Microsoft says it already patched 'Shadow Brokers' NSA leaks
Four exploits were addressed in a March 2017 update, suggesting the company may have been tipped off.