FTP Server No Command Accepted (possible backdoor/proxy)

info Nessus Plugin ID 32374
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.


The remote FTP service is not working properly.


The remote server advertises itself as an FTP server, but it does not accept valid commands, which indicates that it may be a backdoor or a proxy.

Further FTP tests on this port will be disabled to avoid false alerts.

Plugin Details

Severity: Info

ID: 32374

File Name: ftpd_no_cmd.nasl

Version: 1.12

Type: remote

Family: FTP

Published: 5/19/2008

Updated: 8/28/2018

Dependencies: find_service_3digits.nasl, doublecheck_std_services.nasl, logins.nasl

Vulnerability Information

Required KB Items: Settings/ExperimentalScripts