An information exposure vulnerability in forget_passwd.cgi in Synology DiskStation Manager (DSM) before 6.1.3-15152 allows remote attackers to enumerate valid usernames via unspecified vectors.
https://github.com/Ez0-yf/CVE-2017-9554-Exploit-Tool
https://github.com/rfcl/Synology-DiskStation-User-Enumeration-CVE-2017-9554-
https://www.synology.com/en-global/support/security/Synology_SA_17_29_DSM