2825
The hacker estimates that up to 150,000 printers were affected by his effort , but claims to have access to more RCE flaws that he did n't use and which would have allowed him to print to over 300,000 printers .
 ( discover vulnerability: claims to,  more RCE flaws: vulnerability, allowed him to print to over 300,000 printers: capabilities) 
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: claims to,  more RCE flaws: vulnerability, allowed him to print to over 300,000 printers: capabilities) 