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Fencer Vulns
high 7.5

CVE-2021-38425 json

eProsima Fast DDS Network Amplification

published 2022-05-05 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-24877

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
5.0%
EPSS 5.0% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

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.

Patch / fix

  • eProsima Fast DDS 2.4.0 (#2269)
  • fastdds Debian 13, Debian 12 2.6.1+ds-1

debian advisories DEBIAN-CVE-2021-38425

  • fastdds Ubuntu Pro 22.04 LTS 2.5.0+ds-3ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2021-38425

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-21-315-02 updated cvss 7.5

Multiple Data Distribution Service (DDS) Implementations (Update A)

  • Eclipse CycloneDDS <0.8.0 eProsima Fast DDS <2.4.0 GurumNetworks GurumDDS Object Computing, Inc. (OCI) Object Computing Inc. (OCI) OpenDDS <3.18.1 Real-Time Innovations (RTI) Connext DDS Professional and Connext DDS Secure >=4.2x, <6.1.0 Real-Time Innovations (RTI) RTI Connext DDS Micro >=3.0.0
    +1 more products
    TwinOaks Computing CoreDX DDS <5.9.1
    affected: mitigation “Eclipse recommends users apply the latest CycloneDDS patches.” projects.eclipse.org

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

5.02% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:N/A:P

Affected products

  • eProsima Fast DDS

Classification

Weakness
  • CWE-406 Insufficient Control of Network Message Volume (Network Amplification)

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.