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Those reasons are given as : Micro-architectural characteristics that preclude a practical implementation of features mitigating [ Spectre ] Variant 2 ( CVE -2017-5715 ) Limited Commercially Available System Software support Based on customer inputs , most of these products are implemented as “ closed systems ” and therefore are expected to have a lower likelihood of exposure to these vulnerabilities .
 patch vulnerability: mitigating
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: mitigating