No exploitation reportedFix available

CVE-2021-38487

Q: Is CVE-2021-38487 actively exploited?

Active exploitation of CVE-2021-38487 has not been confirmed. Its EPSS score was 3.4% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-38487?

CVE-2021-38487 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

No exploitation reported by the sources we read.

Published2022-05-05
WeaknessCWE-406 · CWE-923

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

RTI Connext Professional versions 4.1 to 6.1.0, and Connext Micro versions 2.4 and later are vulnerable when an attacker sends a specially crafted packet to flood target devices with unwanted traffic. This may result in a denial-of-service condition and information exposure.

Timeline

dates in UTC

2022-05-0517:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-38487?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-38487?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Rti connext dds micro

Branch	Affected	Fixed in	Source
2.4+	≥ 2.4	no fix published	NVD

Rti connext professional

Branch	Affected	Fixed in	Source
6.1	≥ 4.2, < 6.1.0	6.1.0	NVD

Rti connext secure

Branch	Affected	Fixed in	Source
6.1	≥ 4.2, < 6.1.0	6.1.0	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-21-315-02 CISA7 known affected
Multiple Data Distribution Service (DDS) Implementations (Update A)
RTI Connext DDS Micro: Versions 3.0.0 and later · Object Computing Inc. (OCI) OpenDDS: All versions prior to 3.18.1 · Real-Time Innovations (RTI) Connext DDS Professional and Connext DDS Secure: Versions 4.2x to 6.1.0 · +4 more

Full record on NVD

Fix

Mitigation from the vendor CISA ICSA-21-315-02 · 7 productsEclipse recommends users apply the latest CycloneDDS patches.
Mitigation from the vendor CISA ICSA-21-315-02 · 7 productseProsima recommends users apply the latest Fast DDS patches.
Mitigation from the vendor CISA ICSA-21-315-02 · 7 productsOCI recommends users update to Version 3.18.1 of OpenDDS or later.
Mitigation from the vendor CISA ICSA-21-315-02 · 7 productsRTI recommends users apply the available patches for these issues. A patch is available on the RTI customer portal or by contacting RTI Support. Also, contact RTI Support for mitigations, including how to use RTI DDS Secure to mitigate against the network amplification issue defined by CVE-2021-384…
Mitigation from the vendor CISA ICSA-21-315-02 · 7 productsTwin Oaks Computing recommends users apply CoreDX DDS Version 5.9.1 or later, which can be downloaded on the Twin Oaks website (login required).

Advisories and patches

support.rti.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2025-04-16
OpenCVESSVC decisionnone—
CNACVSS 4.08.8read 2026-10-23
CNACVSS 3.18.2read 2026-10-23
NVDCVSS 3.19.1read 2026-10-23
NVDCVSS 2.06.4read 2026-10-23
CNAweakness (CWE)CWE-406, CWE-923read 2026-10-23
FIRST EPSSEPSS score3.4 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CVSS 4.0 vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: 2022-05-05
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-38487?

Is CVE-2021-38487 actively exploited?

Active exploitation of CVE-2021-38487 has not been confirmed. Its EPSS score was 3.4% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-38487?

CVE-2021-38487 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

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