CVE-2026-89028
8.2
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
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| MikroTik | RouterOS | 0 <= 6.49.18 | affected |
| MikroTik | RouterOS | 7.0.0 <= 7.11.2 | affected |
| MikroTik | RouterOS | 7.24.0 | unaffected |
Weaknesses
- CWE-122: Heap-based Buffer Overflow
- CWE-191: Integer Underflow (Wrap or Wraparound)
References
- https://forum.mikrotik.com/t/7-24-stable-is-released/272381
- https://www.vulncheck.com/advisories/mikrotik-routeros-heap-corruption-via-smb1-sessionsetupandx
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