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“ Our experiments reveal several instances of VPN apps that expose users to serious privacy and security vulnerabilities , such as use of insecure VPN tunneling protocols , as well as IPv6 and DNS traffic leakage , ” said researchers Muhammad Ikram , Narseo Vallina - Rodriguez , Suranga Seneviratne , Mohamed Ali Kaafar and Vern Paxson , representing Australia ’s Commonwealth Scientific and Industrial Research Organization ( AU - CSIRO ) , the University of South Wales , and the International Computer Science Institute at the University of California at Berkeley .
 discover vulnerability: reveal
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: reveal