1441
Thousands of industrial control systems ( ICS ) could be at risk of hacking due to critical vulnerabilities affecting a popular piece of software .
 ( discover vulnerability: affecting,  a popular piece of software: vulnerable system, critical vulnerabilities: vulnerability, be at risk of hacking: capabilities, industrial control systems ( ICS ): 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:
 ( discover vulnerability: affecting,  a popular piece of software: vulnerable system, critical vulnerabilities: vulnerability, be at risk of hacking: capabilities, industrial control systems ( ICS ): vulnerable system) 