1588
The Amnesia botnet looks for an unpatched remote code execution vulnerability affecting DVR ( digital video recorder ) appliances manufactured by China - based TVT Digital and identified in nearly identical products from more than 70 global vendors .
 ( discover vulnerability: affecting,  an unpatched remote code execution vulnerability: vulnerability, DVR ( digital video recorder ): vulnerable system, China - based TVT Digital: vulnerable system owner) 
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: affecting,  an unpatched remote code execution vulnerability: vulnerability, DVR ( digital video recorder ): vulnerable system, China - based TVT Digital: vulnerable system owner) 