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A cybersecurity firm called MedSec initially discovered the problems in the St. Jude devices and tipped off the activist investment firm Muddy Waters , which publicized the flaws and advised clients to bet against the health care firm 's stock .
 MedSec: discoverer; the problems: vulnerability; the St. Jude devices: vulnerable system
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:
 MedSec: discoverer; the problems: vulnerability; the St. Jude devices: vulnerable system