CVE-2012-2739

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2012-11-28 · updated 2026-06-16
Weakness: CWE-310

Description

Oracle Java SE before 7 Update 6, and OpenJDK 7 before 7u6 build 12 and 8 before build 39, computes hash values without restricting the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted input to an application that maintains a hash table.

Affected products

Oracle Java SE: through 1.7.0; 1.7.0, 1.7.0-update1, 1.7.0-update2, 1.7.0-update3, 1.7.0-update4
Oracle Java SE: through 1.7.0; 1.7.0, 1.7.0-update1, 1.7.0-update2, 1.7.0-update3, 1.7.0-update4
containers/openjdk: through 1.7.0; 1.6.0, 1.8.0

References

http://armoredbarista.blogspot.de/2012/02/investigating-hashdos-issue.html
http://mail.openjdk.java.net/pipermail/core-libs-dev/2012-May/010238.html
http://www.kb.cert.org/vuls/id/903934
http://www.nruns.com/_downloads/advisory28122011.pdf
http://www.ocert.org/advisories/ocert-2011-003.html
http://www.openwall.com/lists/oss-security/2012/06/15/12
http://www.openwall.com/lists/oss-security/2012/06/17/1
https://bugzilla.redhat.com/show_bug.cgi?id=750533
http://armoredbarista.blogspot.de/2012/02/investigating-hashdos-issue.html
http://mail.openjdk.java.net/pipermail/core-libs-dev/2012-May/010238.html
http://www.kb.cert.org/vuls/id/903934
http://www.nruns.com/_downloads/advisory28122011.pdf

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