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CVE-2026-16347: CWE-307 Improper restriction of excessive authentication attempts in MikroTik RouterOS

0
High
VulnerabilityCVE-2026-16347cvecve-2026-16347cwe-307
Published: 07/28/2026 (07/28/2026, 19:59:29 UTC)
Source: CVE Database V5
Vendor/Project: MikroTik
Product: RouterOS

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.

CVSS v3.1

Score 8.8high

Attack Vector
Adjacent Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Technical Details

Data Version
5.2
Assigner Short Name
icscert
Date Reserved
2026-07-20T20:41:22.596Z
Cvss Version
3.1
State
PUBLISHED
Remediation Level
null

Threat ID: 6a690c0c9c2644c7f822dba8

Added to database: 07/28/2026, 20:07:40 UTC

Last updated: 07/28/2026, 21:00:24 UTC

Views: 5

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