SC-10 SC · System and Communications Protection

Network Disconnect

LOW ✓ MODERATE ✓ HIGH
1 Overlay 2 Related Controls
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Requirements NIST SOURCE

Terminate the network connection associated with a communications session at the end of the session or after [time period] of inactivity.

Discussion (NIST Supplemental Guidance)

Network disconnect applies to internal and external networks. Terminating network connections associated with specific communications sessions includes de-allocating TCP/IP address or port pairs at the operating system level and de-allocating the networking assignments at the application level if multiple application sessions are using a single operating system-level network connection. Periods of inactivity may be established by organizations and include time periods by type of network access or for specific network accesses.

Implementation Guidance

Engineering Interpretation

Original engineering commentary written for this explorer — not NIST source text and not authoritative guidance.

No engineering interpretation has been authored for SC-10 yet. This section is architected to receive it — see the Requirements and Assessment sections above for the authoritative NIST source content in the meantime.

Assessment

NIST SP 800-53A REV 5.2.0

Assessment Objectives

  1. a time period of inactivity after which the system terminates a network connection associated with a communication session is defined;
  2. the network connection associated with a communication session is terminated at the end of the session or after <SC-10_ODP time period> of inactivity.

Examine

[SELECT FROM: System and communications protection policy; procedures addressing network disconnect; system design documentation; security plan; system configuration settings and associated documentation; system audit records; system security plan; other relevant documents or records].

Interview

[SELECT FROM: System/network administrators; organizational personnel with information security responsibilities; system developer].

Test

[SELECT FROM: Mechanisms supporting and/or implementing a network disconnect capability].

Overlays

OT/ICS Overlay SP 800-82r3

NIST SP 800-82r3 Appendix F, Table 22. Blank baseline means the control/control enhancement is not selected in that initial OT baseline.

LOW

Not applicable at this tier.

MODERATE

  • Base control: Included (matches standard baseline)

HIGH

  • Base control: Included (matches standard baseline)

STIGs & CCIs

No STIG checks or CCI mappings are currently loaded for SC-10. This section is architected to display, per product: STIG ID, Finding ID, Severity, Title, Description, Check, Fix, CCI, and NIST control mapping — but nothing is populated here until a real DISA STIG/CCI dataset is ingested.

Learn more about STIG/CCI integration →

Evidence

Potential Evidence — Derived

Categorized from the SP 800-53A "Examine"/"Test" artifact list above by keyword — not an authoritative NIST evidence list.

Policy

  • System and communications protection policy
  • security plan
  • system security plan

Configuration

  • system design documentation
  • system configuration settings and associated documentation

Testing

  • Mechanisms supporting and/or implementing a network disconnect capability

Other Records

  • procedures addressing network disconnect
  • system audit records
  • other relevant documents or records