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SI-04(11) Analyze Communications Traffic Anomalies

NIST SP 800-53 (controls) 5.2.0 against 5.2.0
All changes in this version
unchanged SI part of SI-4

Title

Analyze Communications Traffic Anomalies

Control

Analyze outbound communications traffic at the external interfaces to the system and selected [Assignment: interior points] to discover anomalies.

Discussion

Organization-defined interior points include subnetworks and subsystems. Anomalies within organizational systems include large file transfers, long-time persistent connections, attempts to access information from unexpected locations, the use of unusual protocols and ports, the use of unmonitored network protocols (e.g., IPv6 usage during IPv4 transition), and attempted communications with suspected malicious external addresses.

Parameters

si-04.11_odp: interior points

STIG rules that implement this control 0

No followed STIG rule cites a CCI indexed to this control (CCI list 2026-07-14).