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MikroTik RouterOS SMB service crash via crafted packet on TCP port 445 across versions 6.40.5 through 6.49.10

Last refreshed2026-09-30

Status: NEW  |  Advisory ID: CVE-2024-27686

Key Details

CVECVE-2024-27686
CVSS Score / Version7.5 (High) / CVSS v3.1
Updated2026-06-17
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS Proseattack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is none; integrity impact is none; availability impact is high.
Classified asCWE-400 (Uncontrolled Resource Consumption)

What to Know

Mikrotik RouterOS (x86) 6.40.5 through 6.49.10 (fixed in 7) allows a remote attacker to cause a denial of service (device crash) via crafted packet data to the SMB service on TCP port 445.

References

SourceReference
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2024-27686
CVEhttps://www.cve.org/CVERecord?id=CVE-2024-27686