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Swedish researcher Ulf Frisk discovered the January and February Meltdown mitigations for Win7 and Server 2008 R2 were broken , and went public with his findings once the March Patch Tuesday had kicked off .
 Swedish researcher Ulf Frisk: discoverer; Win7: vulnerable system; Server 2008 R2: vulnerable system; Meltdown: 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:
 Swedish researcher Ulf Frisk: discoverer; Win7: vulnerable system; Server 2008 R2: vulnerable system; Meltdown: vulnerability