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The technical details of security vulnerabilities impacting the Nvidia Video and an Android driver have been revealed by Zimperium , which acquired the flaws as part of an exploit acquisition program .
 discover vulnerability: have been revealed
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: phishing, data breach, ransom, discover vulnerability, patch vulnerability 
Text: {0} 
Answer:
 discover vulnerability: have been revealed