Using Winbox 3.18 on modern RouterOS devices (RouterOS v6.4x, v6.5x, or v7.x) is not recommended due to:
: This release primarily fixed a login issue where Winbox could not connect to routers running RouterOS v6.43 for certain users. Security Warning (CVE-2018-14847) Winbox 3.18 Download
utility, a graphical interface used to manage MikroTik RouterOS devices. While newer versions like Winbox 4.0 Using Winbox 3