523
In March , it released a software patch that addressed the vulnerability exploited by the ransomware , known as WannaCry , protecting systems such as Windows 10 , its latest operating system .
 patch vulnerability: 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: released