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Tavis Ormandy announced during the weekend that he and another Project Zero researcher Natalie Silvanovich discovered " the worst Windows remote code [ execution vulnerability ] in recent memory .
 Project Zero researcher Natalie Silvanovich: discoverer; Tavis Ormandy: discoverer; he: discoverer; the weekend: time; execution vulnerability: 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:
 Project Zero researcher Natalie Silvanovich: discoverer; Tavis Ormandy: discoverer; he: discoverer; the weekend: time; execution vulnerability: vulnerability