CVE-2026-16347 — Improper restriction of excessive authentication attempts in MikroTik RouterOS and Cloud Hosted Router
MikroTik RouterOS contains a weakness in its API authentication handling that lacks effective safeguards against excessive login attempts. The system does not enforce meaningful…
Published: 2026-07-28 · CVSS: 8.7 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7