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

The Exchange receive connector timeout must be limited.

DISA Rule

SV-259697r1043182_rule

Vulnerability Number

V-259697

Group Title

SRG-APP-000295

Rule Version

EX19-MB-000158

Severity

CAT III

CCI(s)

• CCI-002361 - Automatically terminate a user session after organization-defined conditions or trigger events requiring session disconnect.

Weight

10

Fix Recommendation

Update the EDSP to specify the Connection Timeout value.

Open the Exchange Management Shell and enter the following command:

Set-ReceiveConnector -Identity <'IdentityName'> -ConnectionTimeout 00:10:00

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

or

Enter the value as identified by the EDSP that has obtained a signoff with risk acceptance.

Check Contents

Review the Email Domain Security Plan (EDSP) and determine the Connection Timeout value.

Open the Exchange Management Shell and enter the following command:

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

For each Receive connector, if the value of "ConnectionTimeout" is not set to "00:10:00", this is a finding.

or

If "ConnectionTimeout" is set to other than "00:10:00" and has signoff and risk acceptance in the EDSP, this is not a finding.

Vulnerability Number

V-259697

Documentable

False

Rule Version

EX19-MB-000158

Severity Override Guidance

Review the Email Domain Security Plan (EDSP) and determine the Connection Timeout value.

Open the Exchange Management Shell and enter the following command:

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

For each Receive connector, if the value of "ConnectionTimeout" is not set to "00:10:00", this is a finding.

or

If "ConnectionTimeout" is set to other than "00:10:00" and has signoff and risk acceptance in the EDSP, this is not a finding.

Check Content Reference

M

Target Key

5580