321
EternalBlue is a " very fresh vulnerability " given that most breaches that use exploits leverage flaws that have been publicly known for an average of two years or more .
 ( discover vulnerability: known,  two years: time, very fresh vulnerability: vulnerability, EternalBlue: vulnerability, exploits leverage flaws: 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: known,  two years: time, very fresh vulnerability: vulnerability, EternalBlue: vulnerability, exploits leverage flaws: vulnerability) 