CVE-2011-4885
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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 83.4%, higher than 100% of all known CVEs. Patch or mitigate before the next change window.
Description
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.
- CVSS 2.0
- 5.0 MEDIUMAV:N/AC:L/Au:N/C:N/I:N/A:P
- EPSS
- 83.37% probability · 100th percentile
- Public exploits
- 3 in Exploit-DB · verified · first 15 July 2006
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- php/php
- Source
- cve@mitre.org
EPSS 83.4% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
Public exploits (3)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
| EDB-ID | Title | Type | Published | Verified |
|---|---|---|---|---|
| EDB-18305source ↗ | PHP Hash Table Collision - Denial of Service (PoC)php · Christian Mehlmauer | dos | 3 January 2012 | yes |
| EDB-18296source ↗ | PHP 5.3.8 - Hashtables Denial of Servicephp · infodox | dos | 1 January 2012 | no |
| EDB-2012source ↗ | MyBulletinBoard (MyBB) 1.1.5 - 'CLIENT-IP' SQL Injectionphp · rgod | webapps | 15 July 2006 | yes |
References
- 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/903934US 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
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.