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Last fall , Johnson & Johnson had to tell its customers that its insulin pumps had a security vulnerability that hackers could use to access the device and cause a potentially fatal overdose of insulin .
 discover vulnerability: had to tell
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: had to tell