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The Signalling System No. 7 ( SS7 ) telephony signaling protocol used to establish interoperability across some 800 + service providers worldwide , is deeply vulnerable to interception by hackers , criminals , and corrupt insiders .
 discover vulnerability: vulnerable
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: vulnerable