CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HMikroTik RouterOS contains a weakness in its API authentication handling that lacks effective safeguards against excessive login attempts. The system does not enforce meaningful rate-limiting, account lockout, or source-based restrictions, allowing repeated authentication failures to proceed without defensive response. In some versions, a fixed per-connection delay is present, but it can be bypassed through concurrent sessions, resulting in continued high-volume attempts. This deficiency increases the risk that an attacker could eventually obtain valid credentials and gain unauthorized access to administrative services.
A critical vulnerability (CVE-2026-16347) exists in MikroTik RouterOS and Cloud Hosted Router, allowing attackers to rapidly guess passwords and gain unauthorized access by repeatedly attempting logins. No fix is current…