The vulnerability was exploited against a very limited number of targets.
Vulnerable component: MikroTik RouterOS
CVSSv3 score: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
CWE-ID: CWE-287 - Improper Authentication
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The weakness exists due to improper authentication in the exposed by default Winbox interface on port 8291/TCP. A remote attacker can send specially crafted packets to the affected service, bypass authentication, download local database with user accounts and gain full access to the vulnerable device.
Successful exploitation of the vulnerability may result in system compromise.
Note: this vulnerability has being exploited in the wild in April 2018.