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AU-5(1) AU · Audit and Accountability

Storage Capacity Warning

LOW MODERATE ✓ HIGH
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Requirements NIST SOURCE

Provide a warning to [personnel, roles, and/or locations] within [time period] when allocated audit log storage volume reaches [percentage] of repository maximum audit log storage capacity.

Discussion (NIST Supplemental Guidance)

Organizations may have multiple audit log storage repositories distributed across multiple system components with each repository having different storage volume capacities.

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 AU-5(1) 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. personnel, roles, and/or locations to be warned when allocated audit log storage volume reaches a percentage of repository maximum audit log storage capacity.
  2. time period for defined personnel, roles, and/or locations to be warned when allocated audit log storage volume reaches a percentage of repository maximum audit log storage capacity is defined;
  3. percentage of repository maximum audit log storage capacity is defined;
  4. a warning is provided to <AU-05(01)_ODP[01] personnel, roles, and/or locations> within <AU-05(01)_ODP[02] time period> when allocated audit log storage volume reaches <AU-05(01)_ODP[03] percentage> of repository maximum audit log storage capacity.

Examine

[SELECT FROM: Audit and accountability policy; procedures addressing response to audit processing failures; system design documentation; system security plan; privacy system configuration settings and associated documentation; system audit records; other relevant documents or records].

Interview

[SELECT FROM: Organizational personnel with audit and accountability responsibilities; organizational personnel with information security and privacy responsibilities; system/network administrators; system developers].

Test

[SELECT FROM: Mechanisms implementing audit storage limit warnings].

Overlays

Showing the OT/ICS overlay for the parent control AU-5 — see the AU-5(1) entries within each baseline below.

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: Included (matches standard baseline)

MODERATE

  • Base control: Included (matches standard baseline)

HIGH

  • Base control: Included (matches standard baseline)
  • Included: (1) (2)

STIGs & CCIs

No STIG checks or CCI mappings are currently loaded for AU-5(1). 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

  • Audit and accountability policy
  • system security plan

Configuration

  • system design documentation
  • privacy system configuration settings and associated documentation

Testing

  • Mechanisms implementing audit storage limit warnings

Other Records

  • procedures addressing response to audit processing failures
  • system audit records
  • other relevant documents or records