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

The application must protect the confidentiality and integrity of transmitted information.

DISA Rule

SV-259710r961632_rule

Vulnerability Number

V-259710

Group Title

SRG-APP-000439

Rule Version

EX19-MB-000236

Severity

CAT I

CCI(s)

• CCI-001184 - Protect the authenticity of communications sessions.
• CCI-002418 - Protect the confidentiality and/or integrity of transmitted information.

Weight

10

Fix Recommendation

Open the Exchange Management Shell and enter the following command:

Set-ReceiveConnector -Identity <'IdentityName'> -AuthMechanism 'Tls'

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

Repeat the procedures for each Receive connector.

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Note: AuthMechanism may include other mechanisms as long as the "Tls" is identified.

Open the Exchange Management Shell and enter the following command:

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

For each Receive connector, if the value of "AuthMechanism" is not set to "Tls", this is a finding.

Vulnerability Number

V-259710

Documentable

False

Rule Version

EX19-MB-000236

Severity Override Guidance

Note: AuthMechanism may include other mechanisms as long as the "Tls" is identified.

Open the Exchange Management Shell and enter the following command:

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

For each Receive connector, if the value of "AuthMechanism" is not set to "Tls", this is a finding.

Check Content Reference

M

Target Key

5580