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Separately , Microsoft is reportedly working on a fix for a " fatal flaw " in its initial Windows 10 fix for the Meltdown CPU vulnerability .
 patch vulnerability: is reportedly working
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: is reportedly working