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In May last year , the Project Zero security researcher discovered that Symantec Antivirus Engine was vulnerable to buffer overflow when parsing malformed portable - executable header files that resulted in instant blue - screening and kernel memory corruption without user action on Windows .
 discover vulnerability: discovered
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: discovered