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While combing through WikiLeaks ’ Vault 7 data dump , Cisco has unearthed a critical vulnerability affecting 300 + of its switches and one gateway that could be exploited to take over the devices .
 ( discover vulnerability: has unearthed,  Cisco: discoverer, a critical vulnerability: 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: has unearthed,  Cisco: discoverer, a critical vulnerability: vulnerability) 