{"id":"CVE-2011-4885","url":"https://www.cyber-defence.io/tools/cve/CVE-2011-4885","generatedAt":"2026-10-27T18:46:33.256Z","title":"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.","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.","published":"2011-12-30T01:55:02.000Z","lastModified":"2026-06-16T23:35:34.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"2.0","score":5,"severity":"MEDIUM","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P"},"cwe":["CWE-20"],"affected":["php/php"],"epss":{"score":0.8337,"percentile":0.99678,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":3,"verified":true,"firstPublished":"2006-07-15","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":18305,"kind":"exploit","title":"PHP Hash Table Collision - Denial of Service (PoC)","url":"https://www.exploit-db.com/exploits/18305","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/php/dos/18305.py","file":"exploits/php/dos/18305.py","published":"2012-01-03","added":"2012-01-03","updated":"2012-02-13","author":"Christian Mehlmauer","type":"dos","platform":"php","port":null,"verified":true,"codes":["CVE-2011-4885","OSVDB-78115"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":"http://www.ocert.org/advisories/ocert-2011-003.html"},{"edbId":18296,"kind":"exploit","title":"PHP 5.3.8 - Hashtables Denial of Service","url":"https://www.exploit-db.com/exploits/18296","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/php/dos/18296.txt","file":"exploits/php/dos/18296.txt","published":"2012-01-01","added":"2012-01-01","updated":"2016-12-01","author":"infodox","type":"dos","platform":"php","port":null,"verified":false,"codes":["CVE-2011-4885","OSVDB-78115"],"tags":null,"aliases":"hashcollide.txt","applicationUrl":null,"screenshotUrl":null,"referenceUrl":null},{"edbId":2012,"kind":"exploit","title":"MyBulletinBoard (MyBB) 1.1.5 - 'CLIENT-IP' SQL Injection","url":"https://www.exploit-db.com/exploits/2012","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/php/webapps/2012.php","file":"exploits/php/webapps/2012.php","published":"2006-07-15","added":"2006-07-14","updated":"2016-11-09","author":"rgod","type":"webapps","platform":"php","port":null,"verified":true,"codes":["OSVDB-84803","CVE-2011-5035","CVE-2011-5034","CVE-2011-4885","CVE-2011-4858","CVE-2011-4084","CVE-2006-3775","OSVDB-84802","OSVDB-78115","OSVDB-78114","OSVDB-78113","OSVDB-78112","OSVDB-27335"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"urgent","text":"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."},"changes":[],"references":[{"url":"http://archives.neohapsis.com/archives/bugtraq/2011-12/0181.html","source":"cve@mitre.org"},{"url":"http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041","source":"cve@mitre.org"},{"url":"http://lists.apple.com/archives/security-announce/2012/May/msg00001.html","source":"cve@mitre.org"},{"url":"http://lists.opensuse.org/opensuse-security-announce/2012-03/msg00013.html","source":"cve@mitre.org"},{"url":"http://lists.opensuse.org/opensuse-security-announce/2012-03/msg00016.html","source":"cve@mitre.org"},{"url":"http://marc.info/?l=bugtraq&m=132871655717248&w=2","source":"cve@mitre.org"},{"url":"http://marc.info/?l=bugtraq&m=133469208622507&w=2","source":"cve@mitre.org"},{"url":"http://rhn.redhat.com/errata/RHSA-2012-0071.html","source":"cve@mitre.org"},{"url":"http://secunia.com/advisories/47404","source":"cve@mitre.org"},{"url":"http://secunia.com/advisories/48668","source":"cve@mitre.org"},{"url":"http://support.apple.com/kb/HT5281","source":"cve@mitre.org"},{"url":"http://svn.php.net/viewvc?view=revision&revision=321003","source":"cve@mitre.org"},{"url":"http://svn.php.net/viewvc?view=revision&revision=321040","source":"cve@mitre.org"},{"url":"http://www.debian.org/security/2012/dsa-2399","source":"cve@mitre.org"},{"url":"http://www.exploit-db.com/exploits/18296","source":"cve@mitre.org"},{"url":"http://www.exploit-db.com/exploits/18305","source":"cve@mitre.org"},{"url":"http://www.kb.cert.org/vuls/id/903934","tags":["US 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BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}