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CVE-2011-1471

Status: ModifiedMedium (4.3)—Exploit
Severity4.3Medium · CVSS 2.0
Exploitation probability13 %higher than 96% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitAvailablePublished on Exploit-DB

Integer signedness error in zip_stream.c in the Zip extension in PHP before 5.3.6 allows context-dependent attackers to cause a denial of service (CPU consumption) via a malformed archive file that triggers errors in zip_fread function calls.

CVSS

Base score
4.3
Version
2.0
Vector
AV:N/AC:M/Au:N/C:N/I:N/A:P

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
13 %
Percentile among all scored CVEs
96
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.

Affected technologies (1)

PHP — PHP

CWEs

References

Show 20 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2011-1471",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ]
  },
  "affected": [
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      "source": "cve@mitre.org",
      "affectedData": [
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          "vendor": "n/a",
          "product": "n/a",
          "versions": [
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        }
      ]
    }
  ],
  "published": "2011-03-20T02:00:04.877",
  "references": [
    {
      "url": "http://bugs.php.net/bug.php?id=49072",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
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    {
      "url": "http://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html",
      "tags": [
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        "Third Party Advisory"
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      "source": "cve@mitre.org"
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    {
      "url": "http://www.debian.org/security/2011/dsa-2266",
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    },
    {
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      "tags": [
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    },
    {
      "url": "http://www.mandriva.com/security/advisories?name=MDVSA-2011:053",
      "tags": [
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    },
    {
      "url": "http://www.php.net/ChangeLog-5.php",
      "tags": [
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      "source": "cve@mitre.org"
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    {
      "url": "http://www.redhat.com/support/errata/RHSA-2011-1423.html",
      "tags": [
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      "source": "cve@mitre.org"
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    {
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      "tags": [
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      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.vupen.com/english/advisories/2011/0744",
      "tags": [
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    {
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    {
      "url": "http://www.debian.org/security/2011/dsa-2266",
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    },
    {
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    },
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    {
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    },
    {
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      "tags": [
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        "VDB Entry"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.vupen.com/english/advisories/2011/0744",
      "tags": [
        "Permissions Required"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-189"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Integer signedness error in zip_stream.c in the Zip extension in PHP before 5.3.6 allows context-dependent attackers to cause a denial of service (CPU consumption) via a malformed archive file that triggers errors in zip_fread function calls."
    },
    {
      "lang": "es",
      "value": "Error de entero sin signo en zip_stream.c en la extensión Zip en PHP anteriores a v5.3.6 permite a atacantes dependientes de contexto para provocar una denegación de servicio (consumo de CPU) a través de un archivo con formato incorrecto que provoca un error en la llamada a la función zip_fread."
    }
  ],
  "lastModified": "2026-06-16T23:29:24.590",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "45F261A2-52E5-4761-89B7-1BE25E570F4F",
              "versionEndExcluding": "5.2.11"
            },
            {
              "criteria": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B421A0AB-8365-4025-8A2F-B235959D447B",
              "versionEndExcluding": "5.3.6",
              "versionStartIncluding": "5.3.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}