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Earlier this month , at the Security Analyst Summit 2017 , security expert Amihai Neiderman disclosed about the presence of 40 zero - day vulnerabilities in Tizen , the operating system that runs on Samsung smart TVs .
 ( discover vulnerability: disclosed,  security expert Amihai Neiderman: discoverer, 40 zero - day vulnerabilities: vulnerability, Tizen: vulnerable system, the operating system: vulnerable system, Samsung smart TVs: vulnerable system, Earlier this month: time) 
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: disclosed,  security expert Amihai Neiderman: discoverer, 40 zero - day vulnerabilities: vulnerability, Tizen: vulnerable system, the operating system: vulnerable system, Samsung smart TVs: vulnerable system, Earlier this month: time) 