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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,  the Project Zero security researcher: discoverer, Symantec Antivirus Engine: vulnerable system, buffer overflow: vulnerability, instant blue - screening: capabilities, kernel memory corruption: capabilities, May last year: time, Windows: supported platform) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( discover vulnerability: discovered,  the Project Zero security researcher: discoverer, Symantec Antivirus Engine: vulnerable system, buffer overflow: vulnerability, instant blue - screening: capabilities, kernel memory corruption: capabilities, May last year: time, Windows: supported platform) 