BaselineWatch
Desk
Your fleet and your work Fleetyour releases and the hardware they run onTriagewhat needs a decisionWatchlistthe products and platforms you runSaved searchesthe lists you come back to
This instance Sourceswhat is read, how often, under what termsDigestthe daily or weekly summary, and alerts
How it is drawn Appearancethe look and the colour schemeBrandingthe mark this instance wears
Owner sign-in

AC-04(08) Security and Privacy Policy Filters

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

Title

Security and Privacy Policy Filters

Control

(a) Enforce information flow control using [Assignment: organization-defined security or privacy policy filters] as a basis for flow control decisions for [Assignment: organization-defined information flows] ; and
(b) [Selection (one or more): block; strip; modify; quarantine] data after a filter processing failure in accordance with [Assignment: organization-defined security or privacy policy].

Discussion

Organization-defined security or privacy policy filters can address data structures and content. For example, security or privacy policy filters for data structures can check for maximum file lengths, maximum field sizes, and data/file types (for structured and unstructured data). Security or privacy policy filters for data content can check for specific words, enumerated values or data value ranges, and hidden content. Structured data permits the interpretation of data content by applications. Unstructured data refers to digital information without a data structure or with a data structure that does not facilitate the development of rule sets to address the impact or classification level of the information conveyed by the data or the flow enforcement decisions. Unstructured data consists of bitmap objects that are inherently non-language-based (i.e., image, video, or audio files) and textual objects that are based on written or printed languages. Organizations can implement more than one security or privacy policy filter to meet information flow control objectives.

Parameters

ac-4.8_prm_1: organization-defined security or privacy policy filters
ac-4.8_prm_2: organization-defined information flows
ac-4.8_prm_4: organization-defined security or privacy policy
ac-04.08_odp.01: security policy filter
ac-04.08_odp.02: privacy policy filter
ac-04.08_odp.03: information flows
ac-04.08_odp.04: information flows
ac-04.08_odp.05: [block; strip; modify; quarantine]
ac-04.08_odp.06: security policy
ac-04.08_odp.07: privacy policy

STIG rules that implement this control 0

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