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A security researcher that goes by the Twitter handle SandboxEscaper , however , decided it would be a good idea to expose a 0 - day threat to the world on Twitter , without forewarning Microsoft , and even linked to proof on concept code on GitHub that has since been verified as functional .
 a 0 - day: vulnerability; A security researcher: discoverer
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 0 - day: vulnerability; A security researcher: discoverer