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

Exchange internal send connectors must use an authentication level.

DISA Rule

SV-259708r961620_rule

Vulnerability Number

V-259708

Group Title

SRG-APP-000435

Rule Version

EX19-MB-000233

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-SendConnector -Identity <'IdentityName'> -TlsAuthLevel DomainValidation

Note: The <IdentityName> value must be in quotes.

Repeat the procedure for each Send connector.

Check Contents

Open the Exchange Management Shell and enter the following command:

Get-SendConnector | Select-Object -Property Name, Identity, TlsAuthLevel

For each Send connector, if the value of "TlsAuthLevel" is not set to "DomainValidation", this is a finding.

Vulnerability Number

V-259708

Documentable

False

Rule Version

EX19-MB-000233

Severity Override Guidance

Open the Exchange Management Shell and enter the following command:

Get-SendConnector | Select-Object -Property Name, Identity, TlsAuthLevel

For each Send connector, if the value of "TlsAuthLevel" is not set to "DomainValidation", this is a finding.

Check Content Reference

M

Target Key

5580