CVE-2011-4885

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

83.4% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2011-12-30 01:55 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 23:35 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 83.4% in the next 30 days (EPSS).
• Severity: 5.0 MEDIUM (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2011-12-30 01:55 UTC

Last modified

2026-06-16 23:35 UTC

Exploit probability

83.4% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

Record status

Modified

Affected

• PHP ≤ 5.3.8
• PHP 5.0.0
• PHP 5.0.1
• PHP 5.0.2
• PHP 5.0.3
• PHP 5.0.4
• PHP 5.0.5
• PHP 5.1.1

Attack profile CVSS 2.0 · 5.0

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

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