1485
His presentation also detailed several flaws in Western Digital MyCloud NAS hard drives , some of which were made public at the start of March by another researcher who disclosed the bugs .
 ( discover vulnerability: detailed,  several flaws: vulnerability, Western Digital MyCloud NAS hard drives: vulnerable system) 
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: detailed,  several flaws: vulnerability, Western Digital MyCloud NAS hard drives: vulnerable system) 