1529
The first big botnet made up of TVT devices was discovered by Sucuri in June 2016 , consisted of over 25,000 bots , and was used to launch Layer 7 DDoS attacks of up to 50,000 requests per second .
 ( discover vulnerability: was discovered,  Sucuri: discoverer, June 2016: time, TVT devices: vulnerable system, launch Layer 7 DDoS attacks: capabilities) 
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: was discovered,  Sucuri: discoverer, June 2016: time, TVT devices: vulnerable system, launch Layer 7 DDoS attacks: capabilities) 