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Ahead of April 's Patch Tuesday , Microsoft has released patches for the critical flaw , which affects Microsoft Malware Protection Engine , or mpengine.dll , the core of Windows Defender in Windows 10 .
 patch vulnerability: has released
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: has released