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According to IBM X-Force Red researcher Daniel Crowley , out of the 17 previously - unknown vulnerabilities discovered in systems used in four smart cities , eight are deemed critical in severity .
 the 17 previously - unknown vulnerabilities: vulnerability; IBM X-Force Red researcher Daniel Crowley: discoverer; systems: vulnerable system; four smart cities: vulnerable system owner
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:
 the 17 previously - unknown vulnerabilities: vulnerability; IBM X-Force Red researcher Daniel Crowley: discoverer; systems: vulnerable system; four smart cities: vulnerable system owner