MikroTik RouterOS before 7.24 contains a heap memory corruption vulnerability in the userspace SMB daemon that allows remote attackers to corrupt adjacent heap memory by supplying a crafted uniPwdLen value in the SMB1 SessionSetupAndX handler. An attacker can send a malformed SMB1 request with a uniPwdLen field that triggers an integer underflow, causing the resulting value to be used as the copy length in a memory copy operation into a smaller heap buffer, corrupting adjacent heap memory.
History

Thu, 01 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*

Thu, 17 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 17 Sep 2026 03:30:00 +0000

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

Wed, 16 Sep 2026 13:30:00 +0000

Type Values Removed Values Added
Description MikroTik RouterOS before 7.24 contains a heap memory corruption vulnerability in the userspace SMB daemon that allows remote attackers to corrupt adjacent heap memory by supplying a crafted uniPwdLen value in the SMB1 SessionSetupAndX handler. An attacker can send a malformed SMB1 request with a uniPwdLen field that triggers an integer underflow, causing the resulting value to be used as the copy length in a memory copy operation into a smaller heap buffer, corrupting adjacent heap memory.
Title MikroTik RouterOS < 7.24 Heap Corruption via SMB1 SessionSetupAndX
Weaknesses CWE-122
CWE-191
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-09-16T13:12:02.672Z

Updated: 2026-10-01T15:21:51.527Z

Reserved: 2026-09-10T16:23:54.472Z

Link: CVE-2026-89028

cve-icon Vulnrichment

Updated: 2026-09-17T19:16:38.246Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-16T14:17:12.887

Modified: 2026-09-24T21:04:40.340

Link: CVE-2026-89028

cve-icon Redhat

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