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Microsoft ’s updates for the Meltdown microprocessor mega-flaw inadvertently left users running Windows 7 64 - bit systems open to a “ way worse ” flaw , a researcher has claimed .
 a researcher: discoverer; a “ way worse ” flaw: vulnerability; Windows 7 64 - bit systems: vulnerable system; the Meltdown microprocessor mega-flaw: vulnerability
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: discover vulnerability 
  Option: vulnerable system owner, vulnerability, capabilities, time, vulnerable system version, discoverer, common vulnerabilities and exposures, supported platform, vulnerable system 
Text: {0} 
Answer:
 a researcher: discoverer; a “ way worse ” flaw: vulnerability; Windows 7 64 - bit systems: vulnerable system; the Meltdown microprocessor mega-flaw: vulnerability