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.
History

Sat, 03 Oct 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 02 Oct 2026 23:45:00 +0000

Type Values Removed Values Added
First Time appeared Mikrotik
Mikrotik routeros
Vendors & Products Mikrotik
Mikrotik routeros

Fri, 02 Oct 2026 22:30:00 +0000

Type Values Removed Values Added
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.
Title MikroTik RouterOS Integer Underflow
Weaknesses CWE-191
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: icscert

Published: 2026-10-02T22:09:48.298Z

Updated: 2026-10-03T15:52:53.879Z

Reserved: 2026-09-01T17:04:29.818Z

Link: CVE-2026-84411

cve-icon Vulnrichment

Updated: 2026-10-03T15:51:38.861Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-02T23:16:58.417

Modified: 2026-10-06T15:15:48.310

Link: CVE-2026-84411

cve-icon Redhat

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