MTA Open Mail Relaying Allowed (internal)

high Nessus Plugin ID 118017


An open SMTP relay is running on the host.


Nessus has detected that this internal SMTP server allows mail relaying.


Reconfigure your SMTP server so that it cannot be used as an indiscriminate SMTP relay. Make sure that the server uses appropriate access controls to limit the extent to which relaying is possible.

See Also

Plugin Details

Severity: High

ID: 118017

File Name: internal_smtp_relay_detection.nasl

Version: 1.4

Type: remote

Published: 10/10/2018

Updated: 6/1/2020

Configuration: Enable paranoid mode

Risk Information

CVSS Score Rationale: Score from a more in depth analysis done by tenable


Risk Factor: Medium

Score: 5.9


Risk Factor: High

Base Score: 7.8

Temporal Score: 6.6

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: manual


Risk Factor: High

Base Score: 7.5

Temporal Score: 6.9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:X/RC:C

Vulnerability Information

Required KB Items: Settings/ParanoidReport

Excluded KB Items: SMTP/wrapped, SMTP/qmail

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 1/1/1990

Reference Information

CVE: CVE-1999-0512, CVE-2002-1278, CVE-2003-0285

BID: 7580, 8196, 83209