CVE-2011-4885

Status: ModifiedMedium (5)—Exploit
Severity5Medium · CVSS 2.0
Exploitation probability83 %higher than 100% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitAvailablePublished on Exploit-DB
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

Base score: 5
Version: 2.0
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 83 %
Percentile among all scored CVEs: 100
Score date: 10/21/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.
Published on Exploit-DB · PHP Hash Table Collision - Denial of Service (PoC) (1/3/2012)
Published on Exploit-DB · PHP 5.3.8 - Hashtables Denial of Service (1/1/2012)
Published on Exploit-DB · MyBulletinBoard (MyBB) 1.1.5 - 'CLIENT-IP' SQL Injection (7/15/2006)
Affected technologies (1)

PHP — PHP
CWEs

CWE-20
References

Show 54 references
Raw JSON (NVD)

Show
{
  "id": "CVE-2011-4885",
  "cveTags": [],
  "metrics": {
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        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
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  },
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      "affectedData": [
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          "vendor": "n/a",
          "product": "n/a",
          "versions": [
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              "status": "affected",
              "version": "n/a"
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    }
  ],
  "published": "2011-12-30T01:55:01.563",
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      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "PHP anterior a v5.3.9 calcula los valores hash de los parámetros de forma, sin restringir la capacidad de desencadenar colisiones hash predecible, lo que permite a atacantes remotos provocar una denegación de servicio (consumo de CPU) mediante el envío de gran cantidad de parámetros a mano."
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  "lastModified": "2026-06-16T23:35:34.410",
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              "matchCriteriaId": "4933D9DD-A630-4A3D-9D13-9E182F5F6F8C"
            },
            {
              "criteria": "cpe:2.3:a:php:php:5.3.5:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A9E6D530-91FC-42F4-A427-6601238E0187"
            },
            {
              "criteria": "cpe:2.3:a:php:php:5.3.6:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9EC938DB-E066-407F-BDF8-61A1C41136F7"
            },
            {
              "criteria": "cpe:2.3:a:php:php:5.3.7:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "ACDF768D-7F5A-4042-B7DD-398F65F3F094"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}