STIGQter: STIG Summary: Microsoft Exchange 2019 Mailbox Server Security Technical Implementation Guide Version: 2 Release: 3 Benchmark Date: 02 Jul 2025:

The Exchange SMTP automated banner response must not reveal server details.

DISA Rule

SV-259707r961620_rule

Vulnerability Number

V-259707

Group Title

SRG-APP-000435

Rule Version

EX19-MB-000232

Severity

CAT II

CCI(s)

• CCI-002385 - Protect against or limit the effects of organization-defined types of denial of service events.

Weight

10

Fix Recommendation

Open the Exchange Management Shell and enter the following command:

Set-ReceiveConnector -Identity <'IdentityName'> -Banner '220 SMTP Server Ready'

Note: The <IdentityName> and 220 SMTP Server Ready values must be in quotes.

Repeat the procedures for each Receive connector.

Check Contents

Open the Exchange Management Shell and enter the following command:

Get-ReceiveConnector | Select-Object -Property Name, Identity, Banner

For each Receive connector, if the value of "Banner" is not set to "220 SMTP Server Ready", this is a finding.

Vulnerability Number

V-259707

Documentable

False

Rule Version

EX19-MB-000232

Severity Override Guidance

Open the Exchange Management Shell and enter the following command:

Get-ReceiveConnector | Select-Object -Property Name, Identity, Banner

For each Receive connector, if the value of "Banner" is not set to "220 SMTP Server Ready", this is a finding.

Check Content Reference

M

Target Key

5580