Hello,
It has come to our attention that a rogue botnet is currently using a vulnerability in the RouterOS Winbox service, that was patched in RouterOS v6.42.1 in April 23, 2018.
Since all RouterOS devices offer free upgrades with just two clicks, we urge you to upgrade your devices with the "Check for updates" button, if you haven't done so already.
Steps to be taken:
https://wiki.mikrotik.com/wiki/Manual:Securing_Your_Router
All versions from 6.29 (release date: 2015/28/05) to 6.42 (release date 2018/04/20) are vulnerable. Is your device affected? If you have open Winbox access to untrusted networks and are running one of the affected versions: yes, you could be affected. Follow advice above. If Winbox is not available to internet, you might be safe, but upgrade still recommended.
More information about the issue can be found here: https://blog.mikrotik.com
Best regards,
MikroTik
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