An information disclosure flaw was found in the way the Java Virtual Machine (JVM) implementation of Java SE 7 as provided by OpenJDK 7 inc…

published 2019-12-26 6 y ago modified 2026-06-16 4 mo ago also EUVD-2012-4355

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 4.5%; EPSS 4.5% chance of exploitation in 30 days, percentile 91%
public exploits: 0; none known

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.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2012-4420 updated 2026-11-06 cvss 4.3

java-1.7.0-openjdk: JVM heap memory disclosure

Red Hat Enterprise Linux 5 java-1.4.2-ibm, java-1.5.0-ibm, java-1.6.0-ibm, java-1.6.0-sun, java-1.4.2-ibm-sap, java-1.6.0-openjdk, +5 more Red Hat Enterprise Linux 6 java-1.5.0-ibm, java-1.6.0-ibm, java-1.6.0-sun, java-1.7.0-ibm, java-1.7.0-oracle, java-1.4.2-ibm-sap, +30 more
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.51% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

bugs.java.com https://bugs.java.com/bugdatabase/view_bug.do?bug_id=7196857 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

java-1.7.0-openjdk java-1.7.0-openjdk

Classification

Weakness

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

bugs.java.com /bugdatabase/view_bug.do?bug_id=7196857
exploit, issue-tracking, third-party-advisory
bugzilla.redhat.com /show_bug.cgi?id=CVE-2012-4420
issue-tracking, third-party-advisory
access.redhat.com /security/cve/cve-2012-4420
third-party-advisory
exchange.xforce.ibmcloud.com /vulnerabilities/78693
third-party-advisory, vdb-entry
openwall.com /lists/oss-security/2012/09/13/3
mailing-list, third-party-advisory
securityfocus.com /bid/55538
third-party-advisory, vdb-entry
openwall.com /lists/oss-security/2012/09/12/4
mailing-list, third-party-advisory

Sources

CVE List CVE-2012-4420
NVD CVE-2012-4420

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary