421
The events have renewed debate over the secretive process by which the federal government decides whether to disclose a zero - day vulnerability to the product ’s manufacturer , as well as spurring scrutiny of the NSA .
 ( discover vulnerability: disclose,  a zero - day vulnerability: vulnerability, federal government: discoverer, manufacturer: vulnerable system owner) 
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: disclose,  a zero - day vulnerability: vulnerability, federal government: discoverer, manufacturer: vulnerable system owner) 