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Researchers from Positive Technologies have unearthed a critical vulnerability ( CVE -2017-6968 ) in Checker ATM Security by Spanish corporate group GMV Innovating Solutions .
 ( discover vulnerability: unearthed,  Positive Technologies: discoverer, Researchers: discoverer, CVE -2017-6968: common vulnerabilities and exposures, critical vulnerability: vulnerability, Checker ATM Security: vulnerable system, Spanish corporate group GMV Innovating Solutions: vulnerable system owner) 
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: unearthed,  Positive Technologies: discoverer, Researchers: discoverer, CVE -2017-6968: common vulnerabilities and exposures, critical vulnerability: vulnerability, Checker ATM Security: vulnerable system, Spanish corporate group GMV Innovating Solutions: vulnerable system owner) 