1477
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,  Johnson & Johnson: discoverer, Last fall: time, its insulin pumps: vulnerable system, a security vulnerability: vulnerability, hackers could use to access the device: capabilities) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( discover vulnerability: had to tell,  Johnson & Johnson: discoverer, Last fall: time, its insulin pumps: vulnerable system, a security vulnerability: vulnerability, hackers could use to access the device: capabilities) 