How severe is CVE-2012-4420?

CVE-2012-4420 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2012-4420 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-4420?

CVE-2012-4420 affects Oracle Jdk. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2012-4420?

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-2012-4420 published?

CVE-2012-4420 was published on 2019-12-26 and last updated on 2026-06-16.

CVE-2012-4420

CVE-2012-4420 is a high-severity vulnerability in Oracle Jdk with a CVSS 3.x 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 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 5% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Oracle Jdk
Published: 2019-12-26
Last modified: 2026-06-16

Description

An information disclosure flaw was found in the way the Java Virtual Machine (JVM) implementation of Java SE 7 as provided by OpenJDK 7 incorrectly initialized integer arrays after memory allocation (in certain circumstances they had nonzero elements right after the allocation). A remote attacker could use this flaw to obtain potentially sensitive information.

Frequently asked questions

What is CVE-2012-4420?: An information disclosure flaw was found in the way the Java Virtual Machine (JVM) implementation of Java SE 7 as provided by OpenJDK 7 incorrectly initialized integer arrays after memory allocation (in certain circumstances they had nonzero elements right after the allocation). A remote attacker could use this flaw to obtain potentially sensitive information.
How severe is CVE-2012-4420?: CVE-2012-4420 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2012-4420 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2012-4420?: CVE-2012-4420 affects Oracle Jdk. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2012-4420?: 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-2012-4420 published?: CVE-2012-4420 was published on 2019-12-26 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:oracle:jdk:7.0:*:*:*:*:*:*:*

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