Public Date:
750547: CVE-2011-4885 php: hash table collisions CPU usage DoS (oCERT-2011-003)

The MITRE CVE dictionary describes this issue as:

PHP before 5.3.9 computes hash values for form parameters without restricting the ability to trigger hash collisions predictably, which allows remote attackers to cause a denial of service (CPU consumption) by sending many crafted parameters.

Find out more about CVE-2011-4885 from the MITRE CVE dictionary dictionary and NIST NVD.

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).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux version 6 (php) RHSA-2012:0019 2012-01-11
Red Hat Enterprise Linux version 5 (php) RHSA-2012:0033 2012-01-18
Red Hat Enterprise Linux version 5 (php53) RHSA-2012:0019 2012-01-11
Red Hat Enterprise Linux version 4 (php) RHSA-2012:0071 2012-01-30


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