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Shortly after the Struts 2 vulnerability was discovered and documented last week , researchers at Cisco 's Talos said they 'd observed it under “ active attack ” .
 last week: time; the Struts 2 vulnerability: vulnerability
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:
 last week: time; the Struts 2 vulnerability: vulnerability