CVE-2021-43547Public exploitNetwork attack vector

Service interruption via RTPS discovery amplification

Published May 5, 2022 · Updated Apr 16, 2025

Network amplification in Twin Oaks Computing CoreDX DDS before 5.9.1 allows remote attackers to interrupt service with crafted packets. RTPS discovery trusts a spoofable participant locator and repeatedly sends replies until acknowledgment, amplifying one small UDP request into substantially more reflected traffic. Unauthenticated network access is sufficient; the traffic can exhaust network capacity, and published assessments disagree on limited information exposure.

CVSS severity7.5
High
EPSS probability2.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Network amplification in Twin Oaks Computing CoreDX DDS before 5.9.1 allows remote attackers to interrupt service with crafted packets. RTPS discovery trusts a spoofable participant locator and repeatedly sends replies until acknowledgment, amplifying one small UDP request into substantially more reflected traffic. Unauthenticated network access is sufficient; the traffic can exhaust network capacity, and published assessments disagree on limited information exposure.

The record

CVE
CVE-2021-43547
Published
May 5, 2022
Updated
Apr 16, 2025
Vendor
Twin Oaks Computing, Inc.
Product
CoreDX DDS
Classifications
CWE-406, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=unspecified <5.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Twin Oaks Computing, Inc. · CoreDX DDSversion=unspecified <5.9.1

Published CVSS scores

7.5ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
8.5NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:C

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 exploitPublished

Weakness, pattern, technique

CWE-406Insufficient Control of Network Message Volume (Network Amplification)
T1498.002Reflection Amplification

Public exploit references

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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