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Open source server platform Samba has issued patches for two critical vulnerabilities that could be used to launch denial - of - service attacks or allow anyone to change user and administrator passwords .
 patch vulnerability: has issued
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 issued