3077
As the ContextIS researchers who discovered the vulnerabilities explained , this avenue of attack can be abused by crooks to hold users ’ devices for ransom .
 ( discover vulnerability: discovered,  the vulnerabilities: vulnerability, the ContextIS researchers: discoverer, abused by crooks to hold users ’ devices for ransom: 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: discovered,  the vulnerabilities: vulnerability, the ContextIS researchers: discoverer, abused by crooks to hold users ’ devices for ransom: capabilities) 