03.13.12E — Denial-of-Service Protection

Official NIST requirement content

Security requirement

a.[Organization-defined: types of denial-of-service events] the effects of the following types of denial-of-service events: [Organization-defined: SELECTED PARAMETER VALUE].
b.Employ the following safeguards to prevent the denial-of-service events [Organization-defined: safeguards].

Official NIST discussion

Discussion

Denial-of-service events may occur due to a variety of internal and external causes, such as an attack by an adversary or a lack of planning to support organizational needs with respect to capacity and bandwidth. Such attacks can occur across a wide range of network protocols (e.g., IPv4, IPv6). A variety of technologies are available to limit or eliminate the origination and effects of denial-of-service events. For example, boundary protection devices can filter certain types of packets to protect system components on internal networks from being directly affected by or the source of denial-of-service attacks. Employing increased network capacity and bandwidth combined with service redundancy also reduces the susceptibility to denial-of-service events. This requirement is sourced to a control tailored out of the SP 800-53B .13 moderate baseline in SP 800-171.

Official organization-defined parameters

Tailoring decisions required

Resolve these values through the governing organization’s approved tailoring and risk-management process before declaring the requirement implemented.

types of denial-of-service eventsorganization-defined types of denial-of-service eventsthe types of denial-of-service events to be protected against or limited are defined.

SELECTED PARAMETER VALUE

safeguardsorganization-defined safeguards by type of denial-of-service eventthe safeguards to prevent the denial-of-service objective by type of denial-of-service event are defined.

Official protection strategy classifications

Protection strategies supported

These classifications are carried from the official SP 800-172 OSCAL record and help explain the enhanced requirement’s defensive purpose.

PS-CRSCyber Resiliency

PS-PRAPenetration-Resistant Architecture

Bare Metal Cyber interpretation

Implementation perspective

Treat Denial-of-Service Protection as an enhanced CUI protection outcome for elevated threat conditions that must be reflected in the system boundary, documented implementation, operational behavior, and assessment evidence. Pay particular attention to secure architecture, boundary protection, communications security, cryptography, and isolation of CUI processing.

Confirm the federal agency selected this enhanced requirement for the critical program or high-value asset and identify the CUI system components, services, users, and external connections in scope.
Resolve every organization-defined parameter through an approved governance and tailoring process.
Map each clause of the requirement to an accountable owner, implementation mechanism, and evidence source.
Verify that inherited and shared implementations are supported by current provider evidence and responsibility boundaries.
Collect evidence during normal operation and review changes, exceptions, and deficiencies on a risk-based cadence.

Questions to ask

Which critical-program or high-value-asset CUI, data flows, users, and services are protected by this enhanced requirement?
Which portions are implemented locally, inherited, shared, or not applicable, and what evidence supports that determination?
Do the system security plan, deployed configuration, operating process, and assessment evidence tell the same story?
What change, incident, or threshold should trigger reassessment?

Evidence and validation

network and trust-boundary diagrams
firewall and gateway configurations
cryptographic configuration and key records
segmentation and isolation test results

Common failure patterns

diagrams omitting cloud and third-party paths
encryption enabled without key governance
flat trust zones permitting unnecessary lateral movement
boundary rules accumulating without owner review

Official NIST SP 800-172A content

Assessment objectives and methods

Assessment objectives (2)

a.
the effects of [Organization-defined: types of denial-of-service events] are [Organization-defined: SELECTED PARAMETER VALUE].
b.
[Organization-defined: safeguards] are employed to protect against or limit the effects of denial-of-service events.

Examine

System and communications protection policy
procedures addressing denial-of-service protection
list of denial-of-service attacks requiring employment of security safeguards to protect against or limit effects of such attacks
system design documentation
list of security safeguards protecting against or limiting the effects of denial-of-service attacks
system configuration settings and associated documentation
system audit records
system security plan
other relevant documents or records

Interview

System/network administrators
personnel with information security responsibilities
personnel with incident response responsibilities
system developers

Test

Mechanisms protecting against or limiting the effects of denial-of-service attacks

Official source-control relationships

Source NIST SP 800-53 controls

These controls are referenced by the official SP 800-172 Rev. 3 OSCAL record. Open the corresponding control pages for complete control text, enhancements, D3FEND mappings, and related learning.

Source controlSC-5Open SP 800-53 control →

Source record

Authoritative sources

Bare Metal Cyber is an independent educational publisher and is not affiliated with or endorsed by NIST. The official publications, the responsible federal agency, and the governing contract or agreement determine applicability, tailoring, assessment depth, and required implementation.