2815
Microsoft Windows users beware of an unpatched memory corruption bug which could be exploited to cause denial of service ( DoS ) attacks as well as other exploits .
 ( discover vulnerability: beware of,  an unpatched memory corruption bug: vulnerability, Microsoft Windows: vulnerable system) 
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: beware of,  an unpatched memory corruption bug: vulnerability, Microsoft Windows: vulnerable system) 