1617
It was unintentionally introduced in December 2012 as part of a fix for a different issue .
 discover vulnerability: was unintentionally introduced
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: was unintentionally introduced