420
Microsoft issued a patch for its supported systems in March , weeks before Shadow Brokers released the exploit , but many computer systems around the world remained unpatched , leaving them vulnerable to the latest ransomware attack .
 patch vulnerability: 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: issued