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Johnson said the attack was made possible after a city information technology team troubleshooting a separate communications issue with the server inadvertently changed a firewall and left a port , or a channel to the Internet , open for about 24 hours , and hackers who were likely running automated scans of networks looking for such vulnerabilities found it and gained access .
 gained access: capabilities; vulnerabilities: vulnerability; hackers: discoverer
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: discover vulnerability 
  Option: vulnerable system owner, vulnerability, capabilities, time, vulnerable system version, discoverer, common vulnerabilities and exposures, supported platform, vulnerable system 
Text: {0} 
Answer:
 gained access: capabilities; vulnerabilities: vulnerability; hackers: discoverer