3678
The intrusion occurred on December 22 , 2016 , the hacker revealed to have exploited a zero - day vulnerability in the Plone Content Management System Going back to 22nd December 2016 , I tweeted about a 0day vulnerability in Plone CMS which is considered as the most secure CMS till date .
 ( discover vulnerability: exploited,  a zero - day vulnerability: vulnerability, Plone Content Management System: 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: exploited,  a zero - day vulnerability: vulnerability, Plone Content Management System: vulnerable system) 