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Equifax told USA TODAY late Wednesday the criminals who gained access to its customer data exploited a website application vulnerability known as Apache Struts CVE -2017-5638 .
 discover vulnerability: exploited
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:
 discover vulnerability: exploited