Cleartext transmission of sensitive information vulnerability in DDNS in Synology DiskStation Manager (DSM) before 6.2.3-25426-2 allows man-in-the-middle attackers to eavesdrop authentication information of DNSExit via unspecified vectors.
https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1071
https://www.synology.com/security/advisory/Synology_SA_20_18