SMTP Service Cleartext Login Permitted

low Nessus Plugin ID 54582
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 mail server allows cleartext logins.


The remote host is running an SMTP server that advertises that it allows cleartext logins over unencrypted connections. An attacker may be able to uncover user names and passwords by sniffing traffic to the server if a less secure authentication mechanism (i.e. LOGIN or PLAIN) is used.


Configure the service to support less secure authentication mechanisms only over an encrypted channel.

See Also

Plugin Details

Severity: Low

ID: 54582

File Name: smtp_unencrypted_cleartext_logins.nasl

Version: 1.7

Type: remote

Published: 5/19/2011

Updated: 1/19/2021

Dependencies: smtp_authentication.nasl, ssl_supported_versions.nasl

Risk Information

CVSS Score Source: manual

CVSS Score Rationale: Score from an in depth analysis done by tenable.


Risk Factor: Low

Base Score: 2.6

Vector: AV:N/AC:H/Au:N/C:P/I:N/A:N

Vulnerability Information