CVE-2026-89028
MikroTik RouterOS < 7.24 Heap Corruption via SMB1 SessionSetupAndX
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-122 CWE-191 |
| Vendor | mikrotik |
| Product | routeros |
| Published | Sep 16, 2026 |
| Last Updated | Sep 16, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
MikroTik / RouterOS
0 ≤ 6.49.18 7.0.0 ≤ 7.11.2
References
Credits
eeee VulnCheck