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A security researcher that only goes by the nickname of Racco42 discovered the vulnerability on Thursday , January 12 .
 Racco42: discoverer; the vulnerability: vulnerability; Thursday , January 12: time; 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:
 Racco42: discoverer; the vulnerability: vulnerability; Thursday , January 12: time; A security researcher: discoverer