Insertion of sensitive information into sent data vulnerability in synorelayd in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows man-in-the-middle attackers to execute arbitrary commands via inbound QuickConnect traffic.
https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1160
https://www.synology.com/security/advisory/Synology_SA_20_26