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After observing attacks on customers , Cisco is telling users to install the fix for a recently disclosed denial - of - service flaw affecting a number of its security appliances .
 discover vulnerability: affecting
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: affecting