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Researchers at Trustwave are warning of a hidden backdoor in VoIP devices produced by Chinese manufacturer DBL Technology which could allow access by the manufacturer or malicious third parties .
 discover vulnerability: are warning
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: are warning