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Fencer Intel
medium 5.0

CVE-2011-4885 json

PHP before 5.3.9 computes hash values for form parameters without restricting the ability to trigger hash collisions predictably, which all…

published 2011-12-30 14 y ago modified 2026-06-16 4 mo ago also EUVD-2011-4802

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
83.4%
EPSS 83.4% chance of exploitation in 30 days, percentile 99.6%
public exploits
4
Metasploit, Exploit-DB

Summary

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.

Patch / fix

  • php RHEL 4 4.3.9-3.35
  • php-gd RHEL 4 4.3.9-3.35
  • php-imap RHEL 4 4.3.9-3.35
  • php-ldap RHEL 4 4.3.9-3.35
  • php-odbc RHEL 4 4.3.9-3.35
  • php-pear RHEL 4 4.3.9-3.35
  • php-snmp RHEL 4 4.3.9-3.35
  • php-mysql RHEL 4 4.3.9-3.35

red hat advisories RHSA-2012:0071RHSA-2012:0033RHSA-2012:0019

  • php7 openSUSE Tumbleweed 7.0.14-1.4
  • php5 openSUSE Tumbleweed 5.6.28-1.1
  • php8 openSUSE Tumbleweed 8.0.11-1.1

opensuse advisories openSUSE-SU-2024:10290-1openSUSE-SU-2024:10344-1openSUSE-SU-2024:11169-1

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-2011-4885 updated cvss 5.0

php: hash table collisions CPU usage DoS (oCERT-2011-003)

  • Red Hat Enterprise Linux (v. 5 server) php 5.1.6-27.el5_7.4, php53 5.3.3-1.el5_7.5, php-gd 5.1.6-27.el5_7.4, php-cli 5.1.6-27.el5_7.4, php-dba 5.1.6-27.el5_7.4, php-pdo 5.1.6-27.el5_7.4, +32 more
    fixed: vendor fix RHSA-2012:0033
  • Red Hat Enterprise Linux AS version 4 php 4.3.9-3.35, php-gd 4.3.9-3.35, php-imap 4.3.9-3.35, php-ldap 4.3.9-3.35, php-odbc 4.3.9-3.35, php-pear 4.3.9-3.35, +7 more
    fixed: vendor fix RHSA-2012:0071
  • Red Hat Enterprise Linux Desktop Optional (v. 6) php 5.3.3-3.el6_2.5, php-gd 5.3.3-3.el6_2.5, php-cli 5.3.3-3.el6_2.5, php-dba 5.3.3-3.el6_2.5, php-pdo 5.3.3-3.el6_2.5, php-xml 5.3.3-3.el6_2.5, +19 more
    fixed: vendor fix RHSA-2012:0019
  • Red Hat Enterprise Linux Desktop version 4 php 4.3.9-3.35, php-gd 4.3.9-3.35, php-imap 4.3.9-3.35, php-ldap 4.3.9-3.35, php-odbc 4.3.9-3.35, php-pear 4.3.9-3.35, +7 more Red Hat Enterprise Linux ES version 4 php 4.3.9-3.35, php-gd 4.3.9-3.35, php-imap 4.3.9-3.35, php-ldap 4.3.9-3.35, php-odbc 4.3.9-3.35, php-pear 4.3.9-3.35, +7 more
    fixed: vendor fix RHSA-2012:0071
  • Red Hat Enterprise Linux HPC Node (v. 6) php 5.3.3-3.el6_2.5, php-gd 5.3.3-3.el6_2.5, php-cli 5.3.3-3.el6_2.5, php-dba 5.3.3-3.el6_2.5, php-pdo 5.3.3-3.el6_2.5, php-xml 5.3.3-3.el6_2.5, +19 more Red Hat Enterprise Linux HPC Node Optional (v. 6) php 5.3.3-3.el6_2.5, php-gd 5.3.3-3.el6_2.5, php-cli 5.3.3-3.el6_2.5, php-dba 5.3.3-3.el6_2.5, php-pdo 5.3.3-3.el6_2.5, php-xml 5.3.3-3.el6_2.5, +19 more Red Hat Enterprise Linux Server (v. 6) php 5.3.3-3.el6_2.5, php-gd 5.3.3-3.el6_2.5, php-cli 5.3.3-3.el6_2.5, php-dba 5.3.3-3.el6_2.5, php-pdo 5.3.3-3.el6_2.5, php-xml 5.3.3-3.el6_2.5, +19 more Red Hat Enterprise Linux Server Optional (v. 6) php 5.3.3-3.el6_2.5, php-gd 5.3.3-3.el6_2.5, php-cli 5.3.3-3.el6_2.5, php-dba 5.3.3-3.el6_2.5, php-pdo 5.3.3-3.el6_2.5, php-xml 5.3.3-3.el6_2.5, +19 more Red Hat Enterprise Linux Workstation (v. 6) php 5.3.3-3.el6_2.5, php-gd 5.3.3-3.el6_2.5, php-cli 5.3.3-3.el6_2.5, php-dba 5.3.3-3.el6_2.5, php-pdo 5.3.3-3.el6_2.5, php-xml 5.3.3-3.el6_2.5, +19 more Red Hat Enterprise Linux Workstation Optional (v. 6) php 5.3.3-3.el6_2.5, php-gd 5.3.3-3.el6_2.5, php-cli 5.3.3-3.el6_2.5, php-dba 5.3.3-3.el6_2.5, php-pdo 5.3.3-3.el6_2.5, php-xml 5.3.3-3.el6_2.5, +19 more
    fixed: vendor fix RHSA-2012:0019
  • Red Hat Enterprise Linux WS version 4 php 4.3.9-3.35, php-gd 4.3.9-3.35, php-imap 4.3.9-3.35, php-ldap 4.3.9-3.35, php-odbc 4.3.9-3.35, php-pear 4.3.9-3.35, +7 more
    fixed: vendor fix RHSA-2012:0071
  • Red Hat RHEL Desktop Workstation (v. 5 client) php 5.1.6-27.el5_7.4, php53 5.3.3-1.el5_7.5, php-gd 5.1.6-27.el5_7.4, php-cli 5.1.6-27.el5_7.4, php-dba 5.1.6-27.el5_7.4, php-pdo 5.1.6-27.el5_7.4, +32 more
    fixed: vendor fix RHSA-2012:0033

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

Timeline

  1. First public exploit (EDB-2012)
  2. Published

Exploit prediction

83.37% chance of exploitation in the next 30 days, higher than 99.6% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-20 Improper Input Validation
Technology feeds

References

Sources

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.