NIST SP 800-171 Rev 2 · 3.13 System & Communications Protection
3.13.15 Protect session authenticity
Protect the authenticity of communications sessions.
- SPRS weight
- 5
- 5 points deducted from 110 when not implemented.
- CMMC level
- L2
- Level 2 only; not among the 17 Level 1 practices.
- Assessment objectives
- 1
- From NIST SP 800-171A, each one a “determine if” an assessor answers.
What an assessor checks
NIST SP 800-171A breaks 3.13.15 into 1 objectives. Every one has to be met for the requirement to be met; a partial answer scores as not implemented.
- Determine if the authenticity of communications sessions is protected.
- Examine
- [SELECT FROM: System and communications protection policy; procedures addressing session authenticity; security plan; system design documentation; system configuration settings and associated documentation; system audit logs and records; other relevant documents or records].
- Interview
- [SELECT FROM: System or network administrators; personnel with information security responsibilities].
- Test
- [SELECT FROM: Mechanisms supporting or implementing session authenticity].
If it is open: POA&M eligibility
Not POA&M-eligible: above the 1-point ceiling · 5 points deducted
Worth 5 points. No requirement over 1 point may appear on a Level 2 POA&M, so this has to be closed before the assessment.
A POA&M is only permitted at a score of 88 or above, and closes in one 180-day window. Check a full gap list or compute your score.
Where 3.13.15 maps
NIST SP 800-53 Rev 5
- SC-8 Transmission Confidentiality and Integrity
NIST CSF 2.0
No direct mapping.
SOC 2
No direct mapping.
Query it from your own tools
This page and the MacTech CMMC MCP server render the same dataset. Ask your assistant and it will answer from the methodology, not from memory.
lookup_control 3.13.15 get_assessment_objectives 3.13.15 generate_poam_entries ["3.13.15"]
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