---
id: CVE-2026-56719
title: >-
  MikroTik RouterOS before 7.24 contains an out-of-bounds read vulnerability in
  the userspace SMB daemon that allows unauthenticated attackers to read beyond
  the end of the request buffer by supplying a crafted uniPwdLen field value in
  a m…
summary: >-
  MikroTik RouterOS before 7.24 contains an out-of-bounds read vulnerability in
  the userspace SMB daemon that allows unauthenticated attackers to read beyond
  the end of the request buffer by supplying a crafted uniPwdLen field value in
  a m…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L'
cwe:
  - CWE-125
vendor: MikroTik
product: RouterOS
affected:
  - RouterOS <= 6.49.18
  - RouterOS >= 7.0.0 <= 7.11.2
published: '2026-09-16'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T20:44:42.207'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-56719'
references:
  - url: 'https://forum.mikrotik.com/t/7-24-stable-is-released/272381'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/mikrotik-routeros-out-of-bounds-read-via-smb1-sessionsetupandx
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
epss: 0.00393
epssPercentile: 0.30871
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-16T15:51:43.641477Z'
ingestedAt: '2026-09-16T13:56:12.619Z'
---

## Overview

MikroTik RouterOS before 7.24 contains an out-of-bounds read vulnerability in the userspace SMB daemon that allows unauthenticated attackers to read beyond the end of the request buffer by supplying a crafted uniPwdLen field value in a minimal SMB1 SessionSetupAndX frame. The out-of-bounds read occurs in the SessionSetupAndX handler before any credential validation, potentially exposing sensitive memory contents.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.