How severe is CVE-2009-3881?

CVE-2009-3881 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2009-3881 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-3881?

CVE-2009-3881 primarily affects Sun Jre. In total, 38 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-3881?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2009-3881 published?

CVE-2009-3881 was published on 2009-11-09 and last updated on 2026-06-16.

CVE-2009-3881

CVE-2009-3881 is a high-severity vulnerability in Sun Jre with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Sun Jre
Published: 2009-11-09
Last modified: 2026-06-16

Description

Sun Java SE 5.0 before Update 22 and 6 before Update 17, and OpenJDK, does not prevent the existence of children of a resurrected ClassLoader, which allows remote attackers to gain privileges via unspecified vectors, related to an "information leak vulnerability," aka Bug Id 6636650.

Frequently asked questions

What is CVE-2009-3881?: Sun Java SE 5.0 before Update 22 and 6 before Update 17, and OpenJDK, does not prevent the existence of children of a resurrected ClassLoader, which allows remote attackers to gain privileges via unspecified vectors, related to an "information leak vulnerability," aka Bug Id 6636650.
How severe is CVE-2009-3881?: CVE-2009-3881 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2009-3881 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-3881?: CVE-2009-3881 primarily affects Sun Jre. In total, 38 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-3881?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2009-3881 published?: CVE-2009-3881 was published on 2009-11-09 and last updated on 2026-06-16.

References

Affected products (38)

cpe:2.3:a:sun:jre:*:update_21:*:*:*:*:*:*
cpe:2.3:a:sun:jre:*:update_16:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.5.0:update_1:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.5.0:update_11:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.5.0:update_12:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.5.0:update_13:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.5.0:update_14:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.5.0:update_15:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.5.0:update_16:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.5.0:update_17:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.5.0:update_18:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.5.0:update_19:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.5.0:update_2:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.5.0:update_20:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.5.0:update_3:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.5.0:update_4:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.5.0:update_5:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.5.0:update_6:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.5.0:update_7:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.5.0:update_8:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.5.0:update_9:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.5.0:update10:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.6.0:update_1:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.6.0:update_10:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.6.0:update_11:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.6.0:update_12:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.6.0:update_13:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.6.0:update_14:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.6.0:update_15:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.6.0:update_2:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.6.0:update_3:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.6.0:update_4:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.6.0:update_5:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.6.0:update_6:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.6.0:update_7:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.6.0:update_8:*:*:*:*:*:*
cpe:2.3:a:sun:jre:1.6.0:update_9:*:*:*:*:*:*
cpe:2.3:a:sun:openjdk:*:*:*:*:*:*:*:*

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