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WhatsApp has patched a vulnerability in its smartphone code that could have been exploited by miscreants to crash victims ' chat app simply by placing a call .
 discover vulnerability: been exploited
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: phishing, data breach, ransom, discover vulnerability, patch vulnerability 
Text: {0} 
Answer:
 discover vulnerability: been exploited