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Commenting on the serious nature of these software bugs , Cornell computer science professor Emin Gün Sirer said : “ Copycat currencies are at risk ” - meaning that all bitcoin forks are vulnerable to the attack .
 Cornell computer science professor Emin Gün Sirer: discoverer; these software bugs: vulnerability
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:
 Cornell computer science professor Emin Gün Sirer: discoverer; these software bugs: vulnerability