---
title: "CVE-2026-84411: RouterOS - Remote Code Execution & Denial of Service"
description: "RouterOS contains an integer underflow in HTTP request body handling, letting unauthenticated network attackers achieve remote code execution as root or cause denial of service using a crafted request."
url: https://panop.io/threat-heartbeat/CVE-2026-84411/
---

# CVE-2026-84411 RouterOS - Remote Code Execution & Denial of Service

RouterOS contains an integer underflow in HTTP request body handling, letting unauthenticated network attackers achieve remote code execution as root or cause denial of service using a crafted request.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

Proof of concept available

Authentication

Not required

EPSS

0.95% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-84411)

## Details

Type

Remote Code Execution

Impact

Remote Code Execution, Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

2 October 2026

Updated

15 October 2026

Weakness

[CWE-191](https://cwe.mitre.org/data/definitions/191.html)

## Vendor fix

Update to the latest RouterOS version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-84411](https://nvd.nist.gov/vuln/detail/CVE-2026-84411)
- [https://mikrotik.com/download](https://mikrotik.com/download)
- [https://www.cisa.gov/news-events/ics-advisories/icsa-26-272-06](https://www.cisa.gov/news-events/ics-advisories/icsa-26-272-06)
- [https://github.com/cisagov/CSAF/blob/develop/csaf\_files/OT/white/2026/icsa-26-272-06.json](https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-272-06.json)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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