501
Here we had something that spread like wildfire , but the machines that were impacted were probably still susceptible to secondary attacks because the underlying vulnerability probably has n’t been patched .
 patch vulnerability: been patched
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: been patched