3392
Hackers have reportedly hijacked insecure servers exposed to the internet with weak and easy - to - guess passwords .
 ( discover vulnerability: exposed,  hijacked insecure servers: vulnerability, Hackers: discoverer, weak and easy - to - guess passwords: 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: exposed,  hijacked insecure servers: vulnerability, Hackers: discoverer, weak and easy - to - guess passwords: capabilities) 