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

Exchange internal receive connectors must not allow anonymous connections.

DISA Rule

SV-259687r961161_rule

Vulnerability Number

V-259687

Group Title

SRG-APP-000261

Rule Version

EX19-MB-000135

Severity

CAT II

CCI(s)

• CCI-001308 - Automatically update spam protection mechanisms on an organization-defined frequency.

Weight

10

Fix Recommendation

Open the Exchange Management Shell and enter the following command:

Set-ReceiveConnector -Identity ['IdentityName'] -PermissionGroups and enter a valid value user group.

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

Example: Set-ReceiveConnector -Identity <'IdentityName'> -PermissionGroups ExchangeUsers

Repeat the procedures for each Receive connector. This will remove the AnonymousUsers value simultaneously.

Check Contents

Open the Exchange Management Shell and enter the following command:

Get-ReceiveConnector | Select-Object -Property Name, Identity, PermissionGroups |Format-List

For each Receive connector, if the value of "PermissionGroups" is "AnonymousUsers" for any receive connector, this is a finding.

Vulnerability Number

V-259687

Documentable

False

Rule Version

EX19-MB-000135

Severity Override Guidance

Open the Exchange Management Shell and enter the following command:

Get-ReceiveConnector | Select-Object -Property Name, Identity, PermissionGroups |Format-List

For each Receive connector, if the value of "PermissionGroups" is "AnonymousUsers" for any receive connector, this is a finding.

Check Content Reference

M

Target Key

5580