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In a blog post , Leonov explained that he reported the issue to Facebook in October 2016 according to which the ImageMagick flaw was still active and impacted Facebook .
 Facebook: vulnerable system owner; October 2016: time; the issue: vulnerability; he: 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:
 Facebook: vulnerable system owner; October 2016: time; the issue: vulnerability; he: discoverer