Public Date:
781606: CVE-2012-0840 apr: hash table collisions CPU usage DoS

The MITRE CVE dictionary describes this issue as:

tables/apr_hash.c in the Apache Portable Runtime (APR) library through 1.4.5 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-2012-0840 from the MITRE CVE dictionary dictionary and NIST NVD.


The Red Hat Security Response Team has rated this issue as having moderate security impact. A future update may address this issue. For additional information, refer to the Issue Severity Classification:

CVSS v2 metrics

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

Base Score 5
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).

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 6 apr Fix deferred
Red Hat Enterprise Linux 4 apr Will not fix
Red Hat Enterprise Linux 5 apr Fix deferred