Is CVE-2021-38487 in the CISA KEV catalog?

No. CVE-2021-38487 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-38487?

CVE-2021-38487 has a CVSS v3 base score of 8.2 (HIGH).

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

CVE-2021-38487 has an EPSS score of 3.33% (87th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-38487?

Upgrade connext professional to 6.1.0 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-38487

HIGHEPSS 87th pctl

8.2

CVSS v3

NVD

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.

CWE-406 CWE-923

How to fix

Remediation Available

connext professionalNVD

Affected:>= 4.2, < 6.1.0Fixed in:6.1.0CVE-2021-38487derived from NVD

connext secureNVD

Affected:>= 4.2, < 6.1.0Fixed in:6.1.0CVE-2021-38487derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Exploit Intelligence

3.33%probability of exploitation in 30 days

87thpercentile

Elevated risk: more likely to be exploited than 87% of all known CVEs.

References

Vendor Advisory1

support.rti.com

Third-Party Advisory1

cisa.gov

Other references1

rti.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-06-23.