3528
In the past , the fastest spreading worms – like the examples mentioned above – exploited network software flaws to automatically propagate through networks ( whether the Internet or just your internal network ) .
 ( discover vulnerability: exploited,  network software: vulnerable system, flaws: vulnerability) 
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: exploited,  network software: vulnerable system, flaws: vulnerability) 