CP-12 CP · Contingency Planning

Safe Mode

LOW MODERATE HIGH
1 Overlay 5 Related Controls
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Requirements NIST SOURCE

When [conditions] are detected, enter a safe mode of operation with [restrictions].

Discussion (NIST Supplemental Guidance)

For systems that support critical mission and business functions—including military operations, civilian space operations, nuclear power plant operations, and air traffic control operations (especially real-time operational environments)—organizations can identify certain conditions under which those systems revert to a predefined safe mode of operation. The safe mode of operation, which can be activated either automatically or manually, restricts the operations that systems can execute when those conditions are encountered. Restriction includes allowing only selected functions to execute that can be carried out under limited power or with reduced communications bandwidth.

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 CP-12 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. restrictions for safe mode of operation are defined;
  2. conditions detected to enter a safe mode of operation are defined;
  3. a safe mode of operation is entered with <CP-12_ODP[01] restrictions> when <CP-12_ODP[02] conditions> are detected.

Examine

[SELECT FROM: Contingency planning policy; procedures addressing safe mode of operation for the system; contingency plan; system design documentation; system configuration settings and associated documentation; system administration manuals; system operation manuals; system installation manuals; contingency plan test records; incident handling records; system audit records; system security plan; other relevant documents or records].

Interview

[SELECT FROM: Organizational personnel with system operation responsibilities; organizational personnel with information security responsibilities; system/network administrators; system developers].

Test

[SELECT FROM: Mechanisms implementing safe mode of operation].

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

  • Base control: Added (beyond standard baseline)

MODERATE

  • Base control: Added (beyond standard baseline)

HIGH

  • Base control: Added (beyond standard baseline)

STIGs & CCIs

No STIG checks or CCI mappings are currently loaded for CP-12. 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

  • Contingency planning policy
  • contingency plan
  • contingency plan test records
  • system security plan

Configuration

  • system design documentation
  • system configuration settings and associated documentation

Testing

  • Mechanisms implementing safe mode of operation

Other Records

  • procedures addressing safe mode of operation for the system
  • system administration manuals
  • system operation manuals
  • system installation manuals
  • incident handling records
  • system audit records
  • other relevant documents or records