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The IDPS must, for fragmented packets, either block the packets or properly reassemble the packets before inspecting and forwarding.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-206921SRG-NET-000401-IDPS-00203SV-206921r383821_ruleCCI-001310medium
Description
Packet fragmentation is allowed by the TCP/IP specifications and is encouraged in situations where it is needed. However, packet fragmentation has been used to make some attacks harder to detect (by placing them within fragmented packets), and unusual fragmentation has also been used as a form of attack. For example, some network-based attacks have used packets that should not exist in normal communications, such as sending some fragments of a packet but not the first fragment, or sending packet fragments that overlap each other. These, and other types of packet fragmentation, aim to evade the IDPS. Since it is usually not possible to test this capability in a production environment, systems should either be validated in a testing environment or prior to installation. This requirement is usually a function of the design of the IDPS component. Compliance can be verified by acceptance/validation processes or vendor attestation.
STIGDate
Intrusion Detection and Prevention Systems Security Requirements Guide2025-09-22

Related Frameworks

1 mapping across 4 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (6) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

CFG-02Secure Baseline Configurations
1.00
CRY-01Use of Cryptographic Controls
1.00
DCH-01Data Protection
1.00
IAC-21Least Privilege
1.00
NET-12Safeguarding Data Over Open Networks
0.50
TDA-18Input Data Validation
0.50
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (11) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AU-10(1)Association of Identities
1.00
AU-10(2)Validate Binding of Information Producer Identity
1.00
CM-6Configuration Settings
1.00
IA-5(2)Public Key-based Authentication
1.00
SC-13Cryptographic Protection
1.00
SC-20Secure Name/Address Resolution Service (Authoritative Source)
1.00
SC-20(2)Data Origin and Integrity
1.00
SC-21Secure Name/Address Resolution Service (Recursive or Caching Resolver)
1.00
SC-23Session Authenticity
1.00
SC-8(2)Pre- and Post-transmission Handling
1.00

+1 more (top 10 by confidence shown)

CCI1 mapping
CCI-001310
1.00
NIST CSF 2.00 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

PR.DS-10
1.00

Who does this work

7 NICE work roles and 7 EC-Council certifications.

This is an inference across published mappings, not a single claim by anyone. This check maps to a control, which maps to a Cybersecurity Framework outcome, which NIST assigns to the work roles below. EC-Council separately maps its certifications to those same roles.

A certification prepares someone for a role. It is not evidence that a holder is qualified, and neither NIST nor EC-Council has stated that any certification here addresses this check.

Work-role assignments published by NIST (NICE Framework Components 2.2.0 and the CSF 2.0 OLIR crosswalk). Certification mappings published by EC-Council.

Details

Check Text (C-206921r383821_chk)

Verify the IDPS, for fragmented packets, either blocks the packets or properly reassembles the packets before inspecting and forwarding. For fragmented packets, if the IDPS does not either block the packets or properly reassemble the packets before inspecting and forwarding, this is a finding.

Fix Text (F-7175r298276_fix)

Configure the IDPS to, for fragmented packets, either block the packets or properly reassemble the packets before inspecting and forwarding.