Microsoft SMBv1 Server Remote Code Execution Vulnerability

The SMBv1 server in Microsoft allows remote attackers to execute arbitrary code via crafted packets.

Published 19 Oct 2026Updated 19 Oct 202630 sources
CVSS 9.3 ✓ VERIFIED REFERENCE△ CISA KEV

What happened

The SMBv1 server in Microsoft allows remote attackers to execute arbitrary code via crafted packets.

Affected versions

SMBv1 server: See original advisory Fixed: See vendor advisory.

Why it matters

This source correlation may provide earlier visibility while structured CVE metadata is still being updated.

Detection & mitigation

  • Review the original advisory and validate affected versions.
  • Apply vendor-provided updates or mitigations when available.

Public PoC references