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SAN FRANCISCO — Hackers took advantage of an Equifax security vulnerability two months after an industry group discovered the coding flaw and shared a fix for it , raising questions about why Equifax did n't update its software successfully when the danger became known .
 ( patch vulnerability: update,  its software: vulnerable system, Equifax: 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: update,  its software: vulnerable system, Equifax: releaser) 