CVE-2021-38427

MEDIUMNVD 6.67.8▲

6.6

RTI Connext DDS Professional and Connext DDS Secure Versions 4.2.x to 6.1.0 are vulnerable to a stack-based buffer overflow, which may allow a local attacker to execute arbitrary code.

CVSS v3: 6.6
EG Score: 7.8(medium)
EPSS: 27.6%
KEV: Not listed

Published

May 5, 2022

Last Modified

February 5, 2025

References (4)

ics-cert@hqhttps://support.rti.com/s/login/?ec=302&startURL=%2Fs%2F
ics-cert@hqhttps://www.cisa.gov/uscert/ics/advisories/icsa-21-315-02
af854a3a-2127-422b-91ae-364da2661108https://support.rti.com/s/login/?ec=302&startURL=%2Fs%2F
af854a3a-2127-422b-91ae-364da2661108https://www.cisa.gov/uscert/ics/advisories/icsa-21-315-02

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-25 22:45 UTCEG score recompute

Frequently asked(5)

What is CVE-2021-38427?

CVE-2021-38427 is a medium vulnerability published on May 5, 2022. RTI Connext DDS Professional and Connext DDS Secure Versions 4.2.x to 6.1.0 are vulnerable to a stack-based buffer overflow, which may allow a local attacker to execute arbitrary code.

When was CVE-2021-38427 disclosed?

CVE-2021-38427 was first published in the National Vulnerability Database on May 5, 2022, with the most recent update on February 5, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-38427 actively exploited?

CVE-2021-38427 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 27.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-38427?

CVE-2021-38427 has a CVSS v3 base score of 6.6 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 7.8.

How do I remediate CVE-2021-38427?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-38427, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-38427

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(2)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-38427?

🔗 Related CVEs(same CWE)

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Published

Last Modified

References (4)

Frequently asked(5)

Related CVEs(same CWE)