Exchange Internet-facing Receive connectors must offer Transport Layer Security (TLS) before using basic authentication.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-221219	EX16-ED-000180	SV-221219r1043178_rule	CCI-001184	medium
Description
Sending unencrypted email over the Internet increases the risk that messages can be intercepted or altered. TLS is designed to protect confidentiality and data integrity by encrypting email messages between servers and thereby reducing the risk of eavesdropping, interception, and alteration. This setting forces Exchange to offer TLS before using basic authentication.
STIG			Date
Microsoft Exchange 2016 Edge Transport Server Security Technical Implementation Guide			2024-12-06

Related Frameworks

1 mapping across 4 frameworks

SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

NET-09Session Integrity

1.00

DISA STIG Benchmark (XCCDF)V2R6intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)
SCF Secure Traceability Relationship Mapping (STRM)2026.2equal to

NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (30) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-17(2)Protection of Confidentiality and Integrity Using Encryption

1.00

DISA STIG Benchmark (XCCDF)V2R6intersects(normalised)
DISA STIG Benchmark (XCCDF)V1R1our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V1R1intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

AU-10(1)Association of Identities

1.00

DISA STIG Benchmark (XCCDF)V2R6intersects(normalised)
DISA STIG Benchmark (XCCDF)2our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)2intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

AU-10(2)Validate Binding of Information Producer Identity

1.00

DISA STIG Benchmark (XCCDF)V2R6intersects(normalised)
DISA STIG Benchmark (XCCDF)2our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)2intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

AU-9(3)Cryptographic Protection

1.00

DISA STIG Benchmark (XCCDF)V2R6intersects(normalised)
DISA STIG Benchmark (XCCDF)2our copyintersects(normalised)DISA STIG Benchmark (XCCDF)V2R6our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)2intersects(normalised)DISA STIG Benchmark (XCCDF)V2R6intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

CM-14Signed Components

1.00

DISA STIG Benchmark (XCCDF)V2R6intersects(normalised)
DISA STIG Benchmark (XCCDF)V2R2our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V2R2intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

CM-5(3)Signed Components

1.00

DISA STIG Benchmark (XCCDF)V2R6intersects(normalised)
DISA STIG Benchmark (XCCDF)V2R2our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V2R2intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

CM-6Configuration Settings

1.00

DISA STIG Benchmark (XCCDF)V2R6intersects(normalised)
DISA STIG Benchmark (XCCDF)V1R2our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V1R2intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

CM-7Least Functionality

1.00

DISA STIG Benchmark (XCCDF)V2R6intersects(normalised)
DISA STIG Benchmark (XCCDF)V1R1our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V1R1intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

IA-2(1)Multi-factor Authentication to Privileged Accounts

1.00

DISA STIG Benchmark (XCCDF)V2R6intersects(normalised)
DISA STIG Benchmark (XCCDF)1our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)1intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

IA-2(12)Acceptance of PIV Credentials

1.00

DISA STIG Benchmark (XCCDF)V2R6intersects(normalised)
DISA STIG Benchmark (XCCDF)1our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)1intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

+20 more (top 10 by confidence shown)

NIST 800-1710 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

3.13.15

1.00

DISA STIG Benchmark (XCCDF)V2R6intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)
NIST SP 800-171 Rev 2, Appendix DRev 2 (Feb 2020, errata Jan 2021)equal to(normalised)

CCI1 mapping

CCI-001184

1.00

DISA STIG Benchmark (XCCDF)V2R6intersects(normalised)

Details

Check Text (C-221219r1043178_chk)

Open the Exchange Management Shell and enter the following command: Get-ReceiveConnector | Select Name, Identity, AuthMechanism For each receive connector, if the value of "AuthMechanism" is not set to "Tls, BasicAuth, BasicAuthRequireTLS", this is a finding.

Fix Text (F-22923r411784_fix)

Open the Exchange Management Shell and enter the following command: Set-ReceiveConnector -Identity <'IdentityName'> -AuthMechanism 'Tls, BasicAuth, BasicAuthRequireTLS' Note: The <IdentityName> value must be in single quotes. Example only for the Identity: <ServerName>\Frontend <ServerName> Repeat the procedure for each receive connector.