The Exchange Simple Mail Transfer Protocol (SMTP) IP Allow List Connection filter must be enabled.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-221247 | EX16-ED-000510 | SV-221247r961161_rule | CCI-001308 | medium |
| Description | ||||
| Email system availability depends in part on best practice strategies for setting tuning configurations. Careful tuning reduces the risk that system or network congestion will contribute to availability impacts. Filters that govern inbound email evaluation can significantly reduce spam, phishing, and spoofed emails. Filters for messages from blank senders, known spammers, or zero-day attack modifications must be enabled to be effective. Having items identified in the Allow List causes other spam evaluation steps to be bypassed and therefore should be used only with an abundance of caution. If spammers were to learn of entries in the Allow List, it could enable them to plan a denial of service attack (or other attack) by spoofing that source. | ||||
| STIG | Date | |||
| Microsoft Exchange 2016 Edge Transport Server Security Technical Implementation Guide | 2024-12-06 | |||
Related Frameworks
1 mapping across 3 frameworks
Related 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.
- 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 (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.
- DISA STIG Benchmark (XCCDF)V2R6intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
CCI1 mapping
CCI-001308
1.00
- DISA STIG Benchmark (XCCDF)V2R6intersects(normalised)
Details
Check Text (C-221247r961161_chk)
Open the Exchange Management Shell and enter the following command:
Get-IPAllowListConfig | Select Name, Enabled
If the value for "Enabled" is not set to "True", this is a finding.
Fix Text (F-22951r411868_fix)
Open the Exchange Management Shell and enter the following command:
Set-IPAllowListConfig -Enabled $true