Provide references for CVE-2019-6821.
Where can I find more information about CVE-2019-6821?
References are available at: https://ics-cert.us-cert.gov/advisories/ICSA-19-136-01, http://www.securityfocus.com/bid/108366, https://www.schneider-electric.com/en/download/document/SEVD-2019-134-03/.