In OpenSSH 7.9, scp.c in the scp client allows remote SSH servers to bypass intended access restrictions via the filename of . or an empty filename. The impact is modifying the permissions of the target directory on the client side.
Exploitability
AV:NAC:HPR:NUI:RScope
S:UImpact
C:NI:HA:N5.3/CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N