Is CVE-2009-3864 in the CISA KEV catalog?

No. CVE-2009-3864 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2009-3864?

CVE-2009-3864 has a CVSS v2 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2009-3864?

CVE-2009-3864 has an EPSS score of 22.48% (97th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2009-3864

HIGHEPSS 97th pctl

7.5

CVSS v2

NVD

Description

The Java Update functionality in Java Runtime Environment (JRE) in Sun Java SE in JDK and JRE 5.0 before Update 22 and JDK and JRE 6 before Update 17, when a non-English version of Windows is used, does not retrieve available new JRE versions, which allows remote attackers to leverage vulnerabilities in older releases of this software, aka Bug Id 6869694.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

22.48%probability of exploitation in 30 days

97thpercentile

Very high risk: more likely to be exploited than 97% of all known CVEs.

References

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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 2026-04-23.