VIR Vulnerability Intelligence Relay

CVE-2011-4885

medium
Published 2011-12-30 · Modified 2026-04-29
💬 Discuss on Community ✚ Propose mitigation
CVSS v3
—
CVSS v4 NEW
—
not yet in upstream
VIR risk
6.0

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.

Predictions

Exploit likelihood
20%
Patch ETA
—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-18296 dos php
infodox · 2012-01-01

PHP 5.3.8 - Hashtables Denial of Service

Source code queued for fetch — refresh in a moment.
EDB-18305 dos php verified
Christian Mehlmauer · 2012-01-03

PHP Hash Table Collision - Denial of Service (PoC)

Source code queued for fetch — refresh in a moment.
EDB-2012 webapps php verified
rgod · 2006-07-15

MyBulletinBoard (MyBB) 1.1.5 - 'CLIENT-IP' SQL Injection

Source code queued for fetch — refresh in a moment.

Metasploit modules

auxiliary_dos/http/hashcollision_dos rank 300
Hashtable Collisions
Source fetch failed: fetch_error — view the original via the link above.

Application impact
VendorProductVersionsFixed
php phpphp{"endIncluding":"5.3.8"}
php phpphp5.0.0
php phpphp5.0.1
php phpphp5.0.2
php phpphp5.0.3
php phpphp5.0.4
php phpphp5.0.5
php phpphp5.1.1
php phpphp5.1.2
php phpphp5.1.3
php phpphp5.1.4
php phpphp5.1.5
php phpphp5.1.6
php phpphp5.2.0
php phpphp5.2.1
php phpphp5.2.2
php phpphp5.2.3
php phpphp5.2.4
php phpphp5.2.5
php phpphp5.2.6
php phpphp5.2.7
php phpphp5.2.8
php phpphp5.2.9
php phpphp5.2.10
php phpphp5.2.11
php phpphp5.2.12
php phpphp5.2.14
php phpphp5.2.15
php phpphp5.2.16
php phpphp5.2.17
php phpphp5.3.0
php phpphp5.3.1
php phpphp5.3.2
php phpphp5.3.3
php phpphp5.3.4
php phpphp5.3.5
php phpphp5.3.6
php phpphp5.3.7

References

CWEs

CWE-20

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.