750
One of them is U.S. Representative Ted Lieu , who made his position clear to Ars Technica : “ Everyone ’s accounts protected by text - based two - factor authentication , such as bank accounts , are potentially at risk until the FCC and telecom industry fix the devastating SS7 security flaw .
 ( patch vulnerability: fix,  security flaw: vulnerability, SS7: vulnerable system, FCC: releaser, telecom industry: releaser) 
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:
 ( patch vulnerability: fix,  security flaw: vulnerability, SS7: vulnerable system, FCC: releaser, telecom industry: releaser) 