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When DefenseCode first came out with the vulnerability in 2013 , Rapid7 researchers also found a number of flaws in other popular UPnP implementations , and by scanning the Internet , revealed that there were approximately 15 million devices with a vulnerable Broadcom UPnP implementation .
 ( discover vulnerability: found,  Rapid7 researchers: discoverer, flaws: vulnerability, UPnP implementations: 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: found,  Rapid7 researchers: discoverer, flaws: vulnerability, UPnP implementations: vulnerable system) 