2824
However , he also claims to have exploited an undisclosed remote command execution ( RCE ) vulnerability in the web management interface of Xerox printers .
 ( discover vulnerability: claims to have exploited,  he: discoverer, an undisclosed remote command execution ( RCE ) vulnerability: vulnerability, Xerox printers: 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: claims to have exploited,  he: discoverer, an undisclosed remote command execution ( RCE ) vulnerability: vulnerability, Xerox printers: vulnerable system) 