CVE-2026-89028 — MikroTik RouterOS < 7.24 Heap Corruption via SMB1 SessionSetupAndX
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 supplyi…
Published: 2026-09-16 · CVSS: 8.2 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7