CVE-2021-38447Network attack vector

Service interruption via crafted packet amplification

Published May 5, 2022 · Updated Apr 16, 2025

Asymmetric resource consumption in OpenDDS before 3.18.1 allows remote attackers to interrupt service via crafted network packets. The vendor does not disclose the packet fields or exact code path that amplifies traffic; release notes identify only new authentication-resend backoff. An unauthenticated network path to an OpenDDS-based application is required, and the bounded reported consequence is traffic flooding that interrupts service.

CVSS severity8.6
High
EPSS probability2.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Asymmetric resource consumption in OpenDDS before 3.18.1 allows remote attackers to interrupt service via crafted network packets. The vendor does not disclose the packet fields or exact code path that amplifies traffic; release notes identify only new authentication-resend backoff. An unauthenticated network path to an OpenDDS-based application is required, and the bounded reported consequence is traffic flooding that interrupts service.

The record

CVE
CVE-2021-38447
Published
May 5, 2022
Updated
Apr 16, 2025
Vendor
Object Computing, Inc.
Product
OpenDDS
Classifications
CWE-405, T1498.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 5, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <3.18.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Object Computing, Inc. · OpenDDSversion=unspecified <3.18.1

Published CVSS scores

7.5OpenDDSCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.6CISA ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-405Asymmetric Resource Consumption (Amplification)
T1498.002Reflection Amplification

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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