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A flaw in popular messenger apps WhatsApp and Telegram , which could allow hackers to gain access to hundreds of millions of accounts using the very encryption software designed to keep them out , has been discovered by cyber security firm Check Point .
 allow hackers to gain access: capabilities; cyber security firm Check Point: discoverer; Telegram: vulnerable system; messenger apps: vulnerable system; A flaw: vulnerability; designed to keep them out: capabilities; the very encryption software: vulnerable system; WhatsApp: vulnerable system
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:
 allow hackers to gain access: capabilities; cyber security firm Check Point: discoverer; Telegram: vulnerable system; messenger apps: vulnerable system; A flaw: vulnerability; designed to keep them out: capabilities; the very encryption software: vulnerable system; WhatsApp: vulnerable system