514
" There is this stream of liability that flows from the ransomware attack , " he said " That 's liability to individuals , consumers and patients , " WannaCry exploits a vulnerability in older versions of Windows , including Windows 7 and Windows XP .
 ( discover vulnerability: exploits,  a vulnerability: vulnerability, older versions: vulnerable system version, Windows: vulnerable system, Windows 7: vulnerable system, Windows XP: 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: exploits,  a vulnerability: vulnerability, older versions: vulnerable system version, Windows: vulnerable system, Windows 7: vulnerable system, Windows XP: vulnerable system) 