CVE-2026-89028 MikroTik RouterOS - Heap Memory Corruption

MikroTik RouterOS < 7.24 contains a heap memory corruption vulnerability caused by an integer underflow in the SMB1 SessionSetupAndX handler's uniPwdLen field, letting remote attackers corrupt adjacent heap memory, exploit requires crafted SMB1 request.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.58% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Heap Memory Corruption
Impact
Denial Of Service, Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
16 September 2026
Updated
15 October 2026
Weakness
CWE-122

Vendor fix

Update to version 7.24 or later.

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

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