# CA-09 Internal System Connections — NIST 800-53 Rev5 control

> FedRAMP Consolidated Rules for 2026 v2026.07.14.01 · updated 2026-07-14
> Canonical page: /control/ca-9

Canonical id: `ca-9` · family `CA`

> a. Authorize internal connections of [system components] to the system; b. Document, for each internal connection, the interface characteristics, security and privacy requirements, and the nature of the information communicated; c. Terminate internal system connections after [conditions]; and d. Review [frequency] the continued need for each internal connection.

_Control title and statement: NIST SP 800-53 Rev5 catalog (the pinned commit is in `/api` under `control_text`). The FedRAMP rules reference these controls by id only; everything below is what FedRAMP says about this id._

## Rev5 baseline membership

- certification class B
- certification class C
- certification class D

## Key Security Indicators that reach it

- `KSI-CNA-MAT` — Minimizing Attack Surface (Cloud Native Architecture)
  Machine-based information resources are persistently reviewed to ensure they have a minimal attack surface and that lateral movement is minimized if compromised.
- `KSI-CNA-RNT` — Restricting Network Traffic (Cloud Native Architecture)
  Machine-based information resources are persistently reviewed to ensure they are appropriately configured to limit inbound and outbound network traffic.
- `KSI-CNA-ULN` — Using Logical Networking (Cloud Native Architecture)
  Logical networking and related capabilities are used and persistently reviewed to enforce traffic flow controls.

## FedRAMP guidance

_No FedRAMP-specific guidance attaches to this control._