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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
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: phishing, data breach, ransom, discover vulnerability, patch vulnerability 
Text: {0} 
Answer:
 patch vulnerability: update