NetExec SMB NTLMv1 Check

Check if NTLMv1 authentication is accepted on remote hosts (enables downgrade attacks)

Curated and verified by Ahmad Alawneh, penetration tester (OSCP+, CRTE) · Last updated April 10, 2026

Tool: nxc
Category: Credential Attacks / NTLM Relay & Coercion
Platform: linux
Requires: password
Protocols: SMB

Open in Command Manager

Syntax

Angle-bracket tokens are placeholders — replace them with your target's values, or open this command in the app to fill them in and copy the result.

nxc smb '<ip>' -u '<user>' -p '<password>' -M ntlmv1

Credential variants

The same attack using a different authentication material.

NTLM Hash requires NTLM hash

nxc smb '<ip>' -u '<user>' -H '<hash>' -M ntlmv1

Examples

nxc smb '192.168.1.0/24' -u 'user' -p 'password' -M ntlmv1

Tags

nxc smb ntlmv1 downgrade ntlm-relay enumeration

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