CVE Database


Impact: Moderate
Public: 2011-12-28
Bugzilla: 750533: CVE-2012-2739 java: hash table collisions CPU usage DoS (oCERT-2011-003)


The MITRE CVE dictionary describes this issue as:

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.

Find out more about CVE-2012-2739 from the MITRE CVE dictionary and NIST NVD.


This flaw affects various versions of Java as shipped with Red Hat products. A patch is available for Java 7 and Java 8, but not for previous versions of Java shipped with Red Hat products. Although no patch is available for previous versions of Java as shipped with Red Hat products, the impact of this flaw has been addressed in several components that utilize Java HashMap in such a way that may expose a denial of service flaw.

CVSS v2 metrics

NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.

Base Score: 5.0
Base Metrics: AV:N/AC:L/Au:N/C:N/I:N/A:P
Access Vector: Network
Access Complexity: Low
Authentication: None
Confidentiality Impact: None
Integrity Impact: None
Availability Impact: Partial

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat security errata

Platform Errata Release Date

External References


Red Hat would like to thank oCERT for reporting this issue. oCERT acknowledges Julian Wälde and Alexander Klink as the original reporters.

This page is generated automatically and has not been checked for errors or omissions.

For clarification or corrections please contact the Red Hat Security Response Team.