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BBC News notes that security researcher Chris Vickery uncovered vulnerabilities in Topps databases back in December of 2015 and June of 2016 , but he was n't able to get a response from the company by email .
 in December of 2015 and June of 2016: time; vulnerabilities: vulnerability; Topps databases: vulnerable system; security researcher Chris Vickery: 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:
 in December of 2015 and June of 2016: time; vulnerabilities: vulnerability; Topps databases: vulnerable system; security researcher Chris Vickery: discoverer