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Google Project Zero whizkid and Tamagotchi whisperer Natalie Silvanovich discovered and reported the flaw , a memory heap overflow issue , directly to WhatsApp in August .
 Tamagotchi whisperer Natalie Silvanovich: discoverer; Google Project Zero whizkid: discoverer; the flaw: vulnerability; WhatsApp: vulnerable system owner; August: time; a memory heap overflow issue: 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:
 Tamagotchi whisperer Natalie Silvanovich: discoverer; Google Project Zero whizkid: discoverer; the flaw: vulnerability; WhatsApp: vulnerable system owner; August: time; a memory heap overflow issue: vulnerability