3484
The proof - of - concept exploit was developed by Theori , a research and development firm in Austin , which opened its doors last spring .
 ( discover vulnerability: was developed,  proof - of - concept exploit: vulnerability, Theori: discoverer, research and development firm: discoverer) 
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 developed,  proof - of - concept exploit: vulnerability, Theori: discoverer, research and development firm: discoverer) 