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CVE Record

CVE-2021-38425: eProsima Fast DDS Network Amplification

eProsima Fast DDS versions prior to 2.4.0 (#2269) are susceptible to exploitation when an attacker sends a specially crafted packet to flood a target device with unwanted traffic, which may result in a denial-of-service condition and information exposure.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Fast DDS before 2.4.0 can be abused over the network to amplify unwanted traffic toward a target. The main business risk is service disruption; the source also notes possible information exposure. This matters most for environments where Fast DDS supports operational, industrial, robotics, or distributed systems.

Executive priority

Treat as high priority for operational environments using Fast DDS. The urgency comes from unauthenticated network reachability and potential denial of service, not confirmed exploitation in the provided sources.

Technical view

CVE-2021-38425 affects eProsima Fast DDS versions prior to 2.4.0. A specially crafted packet can cause network amplification, flooding a target device with unwanted traffic. The CVSS 3.1 score is 7.5, network-accessible, low complexity, unauthenticated, and primarily availability-impacting.

Likely exposure

Exposure is likely limited to systems using eProsima Fast DDS before 2.4.0. The source bundle does not identify specific downstream products, deployment defaults, ports, or internet exposure patterns.

Exploitation context

The provided sources do not support a claim of active exploitation, and this CVE is not marked KEV. Exploitation requires network reachability to affected Fast DDS behavior and can result in denial of service.

Researcher notes

Evidence is sufficient for affected component, version threshold, and impact class. It is incomplete for affected downstream products, exploit availability, practical exposure prevalence, and detailed remediation beyond upgrading and checking vendor guidance.

Mitigation direction

  • Upgrade eProsima Fast DDS to version 2.4.0 or later.
  • Review CISA advisory ICSA-21-315-02 for vendor mitigation guidance.
  • Inventory products and services that embed or package Fast DDS.
  • Limit Fast DDS exposure to trusted networks where operationally possible.

Validation and detection

  • Confirm whether Fast DDS is present in software bills of materials.
  • Check deployed Fast DDS versions against the 2.4.0 fixed threshold.
  • Review network paths where Fast DDS traffic can reach operational systems.
  • Monitor for unusual amplification, flooding, or denial-of-service symptoms.
Prepared
Confidence
high
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-406: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2021-38425 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2021-38425Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
eProsimaFast DDSunspecifiedListed
Weakness

CWE details

CWE-406

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-406 · source CWE mapping

Insufficient Control of Network Message Volume (Network Amplification)

Insufficient Control of Network Message Volume (Network Amplification) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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