Provide references for CVE-2021-23909.
Where can I find more information about CVE-2021-23909?
References are available at: https://media.daimler.com/marsMediaSite/en/instance/ko.xhtml?oid=49946866, https://keenlab.tencent.com/en/2021/05/12/Tencent-Security-Keen-Lab-Experimental-Security-Assessment-on-Mercedes-Benz-Cars/, https://keenlab.tencent.com/en/whitepapers/Mercedes_Benz_Security_Research_Report_Final.pdf.