2550
A month later , a researcher found that an Internet - connected Barbie doll made by Mattel contained vulnerabilities that might allow hackers to intercept real - time conversations .
 ( discover vulnerability: found,  a researcher: discoverer, A month later: time, an Internet - connected Barbie doll: vulnerable system, Mattel: vulnerable system owner, vulnerabilities: vulnerability, allow hackers to intercept real - time conversations: 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: found,  a researcher: discoverer, A month later: time, an Internet - connected Barbie doll: vulnerable system, Mattel: vulnerable system owner, vulnerabilities: vulnerability, allow hackers to intercept real - time conversations: capabilities) 