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CVE-2026-84411— MikroTik RouterOS Integer Underflow

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.

在受影响的 RouterOS 版本中，Web 管理服务存在整数下溢漏洞，该漏洞出现在 HTTP 请求体处理逻辑中，且可在身份验证前被访问。未认证的网络攻击者可以利用此漏洞，通过发送单个精心构造的请求，以 root 权限实现任意代码执行，或导致拒绝服务。

CVSS 9.8 · Critical

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-84411

Vulnerability Information
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Vulnerability Title
MikroTik RouterOS Integer Underflow
Source: CVE Program / CVE List V5
Vulnerability Description
The web management service in affected RouterOS versions contains an integer underflow in its HTTP request body handling that is reachable before authentication. This can be leveraged by an unauthenticated network attacker to achieve arbitrary code execution as root, or to cause a denial of service, using a single crafted request.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MikroTik RouterOS 0 ~ 7.24 -

II. Public POCs for CVE-2026-84411

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III. Intelligence Information for CVE-2026-84411

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Other References for CVE-2026-84411 (3)

IV. Related Vulnerabilities

Same product: RouterOS
Same vendor: MikroTik
Same weakness: CWE-191

V. Comments for CVE-2026-84411

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