OCTOBER 13, 2026
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Case File

CVE-2026-89028

HIGH · CVSS 7.5 EPSS 0.58%

Source: NVD + CISA KEV + EPSS · Published 2026-09-16 · Last synced 2026-10-13

CyberRota Analysis

AI-Generated

MikroTik RouterOS versions prior to 7.24 are vulnerable to a heap memory corruption issue in the SMB daemon, which can be exploited by remote attackers through specially crafted SMB1 requests. This vulnerability allows attackers to corrupt adjacent heap memory, potentially leading to arbitrary code execution or system crashes. Organizations using affected MikroTik devices should prioritize patching to mitigate the risk of exploitation.

CVE
CVE-2026-89028
Severity
HIGH
CVSS
7.5
EPSS
0.58%

Original NVD 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.