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Servers and applications

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.

Severity
Medium 5.0
Published
30 Dec 2011
Last changed
16 Jun 2026
Added to UpHeron
14 Oct 2026
Exploit chance
83% in the next 30 daysHigher than 99% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Improper input validation (CWE-20)
Attack
Over the network · No login needed
Attacker can
Slow it down
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
Sources
NVD

Affected software

SoftwareAffected versions
PHPServers and applications · cpe:a:php:php
  • Version 5.3.7
  • Version 5.3.6
  • Version 5.3.5
  • Version 5.3.4
All 45 release lines
  • Every version up to 5.3.8
  • Version 5.0.0-beta1
  • Version 5.0.0-beta2
  • Version 5.0.0-beta3
  • Version 5.0.0-beta4
  • Version 5.0.0-rc1
  • Version 5.0.0-rc2
  • Version 5.0.0-rc3
  • Version 5.0.0
  • Version 5.0.1
  • Version 5.0.2
  • Version 5.0.3
  • Version 5.0.4
  • Version 5.0.5
  • Version 5.1.1
  • Version 5.1.2
  • Version 5.1.3
  • Version 5.1.4
  • Version 5.1.5
  • Version 5.1.6
  • Version 5.2.0
  • Version 5.2.1
  • Version 5.2.2
  • Version 5.2.3
  • Version 5.2.4
  • Version 5.2.5
  • Version 5.2.6
  • Version 5.2.7
  • Version 5.2.8
  • Version 5.2.9
  • Version 5.2.10
  • Version 5.2.11
  • Version 5.2.12
  • Version 5.2.14
  • Version 5.2.15
  • Version 5.2.16
  • Version 5.2.17
  • Version 5.3.0
  • Version 5.3.1
  • Version 5.3.2
  • Version 5.3.3
  • Version 5.3.4
  • Version 5.3.5
  • Version 5.3.6
  • Version 5.3.7

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2011-4885
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2011-4885