STIGQter: STIG Summary: Microsoft Exchange 2019 Edge Server Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 30 Jan 2025:

Exchange receive connector maximum hop count must be 60.

DISA Rule

SV-259599r961155_rule

Vulnerability Number

V-259599

Group Title

SRG-APP-000247

Rule Version

EX19-ED-000112

Severity

CAT II

CCI(s)

• CCI-001095 - Manage capacity, bandwidth, or other redundancy to limit the effects of information flooding types of denial of service attacks.

Weight

10

Fix Recommendation

Update the EDSP to reflect the value for receive connectors.

Open the Exchange Management Shell and enter the following command:

Set-ReceiveConnector -Identity <'IdentityName'> -MaxHopCount 60

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

or

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

Repeat the procedure for each receive connector.

Check Contents

Review the Email Domain Security Plan (EDSP).

Determine the value for receive connectors.

Open the Exchange Management Shell and enter the following command:

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

For each receive connector, if the value of "MaxHopCount" is not set to "60", this is a finding.

or

If the value of "MaxHopCount" is set to a value other than "60" and has signoff and risk acceptance, this is not a finding.

Vulnerability Number

V-259599

Documentable

False

Rule Version

EX19-ED-000112

Severity Override Guidance

Review the Email Domain Security Plan (EDSP).

Determine the value for receive connectors.

Open the Exchange Management Shell and enter the following command:

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

For each receive connector, if the value of "MaxHopCount" is not set to "60", this is a finding.

or

If the value of "MaxHopCount" is set to a value other than "60" and has signoff and risk acceptance, this is not a finding.

Check Content Reference

M

Target Key

5579