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In the past , the fastest spreading worms – like the examples mentioned above – exploited network software flaws to automatically propagate through networks ( whether the Internet or just your internal network ) .
 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