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CVE PROGRAM SOURCE RECORD8.7 High

CVE-2026-16347

Improper restriction of excessive authentication attempts in MikroTik RouterOS and Cloud Hosted Router

Description

MikroTik 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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

MikroTik RouterOS

Default version status: affected

  • All versionsaffected

MikroTik Cloud Hosted Router

Default version status: affected

  • All versionsaffected

References