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Microsoft has quickly reacted to the disclosure of a previously unknown zero - day vulnerability in the Windows operating system .
 Microsoft: discoverer; a previously unknown zero - day vulnerability: vulnerability; the Windows operating system: vulnerable system
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:
 Microsoft: discoverer; a previously unknown zero - day vulnerability: vulnerability; the Windows operating system: vulnerable system