645
Earlier this year , hackers exploited vulnerabilities in the Signaling System No. 7 ( SS7 ) protocols to sidestep two - factor authentication and steal funds from German victims ' bank accounts , according to Germany 's Suddeutsche Zeitung .
 ( discover vulnerability: exploited,  vulnerabilities: vulnerability, Signaling System No. 7: vulnerable system, SS7: vulnerable system, protocols to sidestep two - factor authentication: capabilities, Earlier this year: time) 
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: exploited,  vulnerabilities: vulnerability, Signaling System No. 7: vulnerable system, SS7: vulnerable system, protocols to sidestep two - factor authentication: capabilities, Earlier this year: time) 