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CVE-2026-16347— Improper restriction of excessive authentication attempts in MikroTik RouterOS and Cloud Hosted Router

Quick assessment

Affected
MikroTik RouterOS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MikroTik routeros是拉脱维亚MikroTik公司的一款网络操作系统软件。 MikroTik RouterOS和MikroTik Cloud Hosted Router存在授权问题漏洞，该漏洞源于API身份验证处理缺少有效防护，未实施速率限制、账户锁定或源限制，且固定延迟可通过并发会话绕过，可能导致攻击者进行重复登录尝试，最终获取有效凭据并未经授权访问管理服务。

CVSS 8.8 · High EPSS 0.39% · P31

Possible ATT&CK Techniques 1 AI

T1110 · Brute Force

Affected Version Matrix 2

VendorProduct Version RangeStatus
MikroTik Cloud Hosted Router All versions affected
MikroTik RouterOS All versions affected
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I. Basic Information for CVE-2026-16347

Vulnerability Information
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Vulnerability Title
Improper restriction of excessive authentication attempts in MikroTik RouterOS and Cloud Hosted Router
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
过多认证尝试的限制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
MikroTik RouterOS 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MikroTik routeros是拉脱维亚MikroTik公司的一款网络操作系统软件。 MikroTik RouterOS和MikroTik Cloud Hosted Router存在授权问题漏洞，该漏洞源于API身份验证处理缺少有效防护，未实施速率限制、账户锁定或源限制，且固定延迟可通过并发会话绕过，可能导致攻击者进行重复登录尝试，最终获取有效凭据并未经授权访问管理服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
MikroTik RouterOS All versions -
MikroTik Cloud Hosted Router All versions -

II. Public POCs for CVE-2026-16347

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III. Intelligence Information for CVE-2026-16347

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Vendor Advisories for CVE-2026-16347 (1)

IV. Related Vulnerabilities

Same product: RouterOS
Same vendor: MikroTik
Same weakness: CWE-307

V. Comments for CVE-2026-16347

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