CVE-2011-4885

Exp

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.

Published: 2011-12-30 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-4885 is rated High Exploit Risk (69/100): CVSS Medium severity, with high exploitation likelihood (EPSS 85.81%, 99th percentile). 3 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2011-4885

EDB-ID Source Kind Published Link
18305 exploit_db edb 2012-01-03 Exploit-DB ↗
18296 exploit_db edb 2012-01-01 Exploit-DB ↗
2012 exploit_db edb 2006-07-15 Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2011-4885

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-13 86.57% 85.81% -0.76%
2 2026-03-04 85.10% 86.57% +1.47%
3 2026-03-01 — 85.10% —

Full EPSS history (47 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-4885

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2011-4885

OS Trackers for CVE-2011-4885

vendor priority summary link
gentoo high CVE-2011-4885: 1 GLSA(s) (201209-03), 1 atom(s) (dev-lang/php); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2011-4885
redhat medium — https://access.redhat.com/security/cve/CVE-2011-4885
suse medium CVE-2011-4885 severity moderate: SUSE including 426 source package names (apache2-mod_php5-5.2.14-0.7.30.34.1, apache2-mod_php5-5.6.28-1.1, …), 426 product×package rows across 14 product lines (SUSE Linux Enterprise Server 11 SP1-TERADATA, SUSE Linux Enterprise Server 11 SP2, … (14 product lines)): Fixed 426. https://www.suse.com/security/cve/CVE-2011-4885/
ubuntu medium CVE-2011-4885 medium priority: Ubuntu including 1 source packages (php5), 6 status rows across 6 suites (hardy, lucid, maverick, natty, oneiric, upstream): released 6. https://ubuntu.com/security/CVE-2011-4885

Affected software / configurations for CVE-2011-4885

Vendor Product Version Raw CPE
php php <= 5.3.8 cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
php php 5.0.0 cpe:2.3:a:php:php:5.0.0:*:*:*:*:*:*:*
php php 5.0.0 cpe:2.3:a:php:php:5.0.0:beta1:*:*:*:*:*:*
php php 5.0.0 cpe:2.3:a:php:php:5.0.0:beta2:*:*:*:*:*:*
php php 5.0.0 cpe:2.3:a:php:php:5.0.0:beta3:*:*:*:*:*:*
php php 5.0.0 cpe:2.3:a:php:php:5.0.0:beta4:*:*:*:*:*:*
php php 5.0.0 cpe:2.3:a:php:php:5.0.0:rc1:*:*:*:*:*:*
php php 5.0.0 cpe:2.3:a:php:php:5.0.0:rc2:*:*:*:*:*:*
php php 5.0.0 cpe:2.3:a:php:php:5.0.0:rc3:*:*:*:*:*:*
php php 5.0.1 cpe:2.3:a:php:php:5.0.1:*:*:*:*:*:*:*
php php 5.0.2 cpe:2.3:a:php:php:5.0.2:*:*:*:*:*:*:*
php php 5.0.3 cpe:2.3:a:php:php:5.0.3:*:*:*:*:*:*:*
php php 5.0.4 cpe:2.3:a:php:php:5.0.4:*:*:*:*:*:*:*
php php 5.0.5 cpe:2.3:a:php:php:5.0.5:*:*:*:*:*:*:*
php php 5.1.1 cpe:2.3:a:php:php:5.1.1:*:*:*:*:*:*:*
php php 5.1.2 cpe:2.3:a:php:php:5.1.2:*:*:*:*:*:*:*
php php 5.1.3 cpe:2.3:a:php:php:5.1.3:*:*:*:*:*:*:*
php php 5.1.4 cpe:2.3:a:php:php:5.1.4:*:*:*:*:*:*:*
php php 5.1.5 cpe:2.3:a:php:php:5.1.5:*:*:*:*:*:*:*
php php 5.1.6 cpe:2.3:a:php:php:5.1.6:*:*:*:*:*:*:*
php php 5.2.0 cpe:2.3:a:php:php:5.2.0:*:*:*:*:*:*:*
php php 5.2.1 cpe:2.3:a:php:php:5.2.1:*:*:*:*:*:*:*
php php 5.2.2 cpe:2.3:a:php:php:5.2.2:*:*:*:*:*:*:*
php php 5.2.3 cpe:2.3:a:php:php:5.2.3:*:*:*:*:*:*:*
php php 5.2.4 cpe:2.3:a:php:php:5.2.4:*:*:*:*:*:*:*
php php 5.2.5 cpe:2.3:a:php:php:5.2.5:*:*:*:*:*:*:*
php php 5.2.6 cpe:2.3:a:php:php:5.2.6:*:*:*:*:*:*:*
php php 5.2.7 cpe:2.3:a:php:php:5.2.7:*:*:*:*:*:*:*
php php 5.2.8 cpe:2.3:a:php:php:5.2.8:*:*:*:*:*:*:*
php php 5.2.9 cpe:2.3:a:php:php:5.2.9:*:*:*:*:*:*:*
php php 5.2.10 cpe:2.3:a:php:php:5.2.10:*:*:*:*:*:*:*
php php 5.2.11 cpe:2.3:a:php:php:5.2.11:*:*:*:*:*:*:*
php php 5.2.12 cpe:2.3:a:php:php:5.2.12:*:*:*:*:*:*:*
php php 5.2.14 cpe:2.3:a:php:php:5.2.14:*:*:*:*:*:*:*
php php 5.2.15 cpe:2.3:a:php:php:5.2.15:*:*:*:*:*:*:*
php php 5.2.16 cpe:2.3:a:php:php:5.2.16:*:*:*:*:*:*:*
php php 5.2.17 cpe:2.3:a:php:php:5.2.17:*:*:*:*:*:*:*
php php 5.3.0 cpe:2.3:a:php:php:5.3.0:*:*:*:*:*:*:*
php php 5.3.1 cpe:2.3:a:php:php:5.3.1:*:*:*:*:*:*:*
php php 5.3.2 cpe:2.3:a:php:php:5.3.2:*:*:*:*:*:*:*
php php 5.3.3 cpe:2.3:a:php:php:5.3.3:*:*:*:*:*:*:*
php php 5.3.4 cpe:2.3:a:php:php:5.3.4:*:*:*:*:*:*:*
php php 5.3.5 cpe:2.3:a:php:php:5.3.5:*:*:*:*:*:*:*
php php 5.3.6 cpe:2.3:a:php:php:5.3.6:*:*:*:*:*:*:*
php php 5.3.7 cpe:2.3:a:php:php:5.3.7:*:*:*:*:*:*:*

References for CVE-2011-4885

URL Tags
http://archives.neohapsis.com/archives/bugtraq/2011-12/0181.html
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041
http://lists.apple.com/archives/security-announce/2012/May/msg00001.html
http://lists.opensuse.org/opensuse-security-announce/2012-03/msg00013.html
http://lists.opensuse.org/opensuse-security-announce/2012-03/msg00016.html
http://marc.info/?l=bugtraq&m=132871655717248&w=2
http://marc.info/?l=bugtraq&m=133469208622507&w=2
http://rhn.redhat.com/errata/RHSA-2012-0071.html
http://secunia.com/advisories/47404
http://secunia.com/advisories/48668
http://support.apple.com/kb/HT5281
http://svn.php.net/viewvc?view=revision&revision=321003
http://svn.php.net/viewvc?view=revision&revision=321040
http://www.debian.org/security/2012/dsa-2399
http://www.exploit-db.com/exploits/18296
http://www.exploit-db.com/exploits/18305
http://www.kb.cert.org/vuls/id/903934 US Government Resource
http://www.mandriva.com/security/advisories?name=MDVSA-2011:197
http://www.mandriva.com/security/advisories?name=MDVSA-2013:150
http://www.nruns.com/_downloads/advisory28122011.pdf
http://www.ocert.org/advisories/ocert-2011-003.html
http://www.oracle.com/technetwork/topics/security/cpujul2012-392727.html
http://www.redhat.com/support/errata/RHSA-2012-0019.html
http://www.securityfocus.com/bid/51193
http://www.securitytracker.com/id?1026473
https://exchange.xforce.ibmcloud.com/vulnerabilities/72021
https://github.com/FireFart/HashCollision-DOS-POC/blob/master/HashtablePOC.py
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