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,  vulnerability: vulnerability, the machines: vulnerable system) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( patch vulnerability: been patched,  vulnerability: vulnerability, the machines: vulnerable system) 