2071
Some medical devices , smartphones and internet of things gadgets contain certain types of sensors that are vulnerable to potential hacking using sound waves , says cybersecurity researcher Kevin Fu .
 ( discover vulnerability: says,  cybersecurity researcher Kevin Fu: discoverer) 
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. 
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Answer:
 ( discover vulnerability: says,  cybersecurity researcher Kevin Fu: discoverer) 