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In February , Zimperium launched an N - day acquisition program which is only interested in known security problems , rather than unknown and unpatched zero - days .
 ( discover vulnerability: launched,  February: time, Zimperium: discoverer, an N - day acquisition program: vulnerability, known security problems: vulnerability) 
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: launched,  February: time, Zimperium: discoverer, an N - day acquisition program: vulnerability, known security problems: vulnerability) 