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CVE-2009-3695

Status: ModifiedMedium (5)—

Algorithmic complexity vulnerability in the forms library in Django 1.0 before 1.0.4 and 1.1 before 1.1.1 allows remote attackers to cause a denial of service (CPU consumption) via a crafted (1) EmailField (email address) or (2) URLField (URL) that triggers a large amount of backtracking in a regular expression.

CVSS

Exploitation probability (EPSS)

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).

Affected technologies (1)

Djangoproject — Django

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2009-3695",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "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
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
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      ]
    }
  ],
  "published": "2009-10-13T10:30:00.767",
  "references": [
    {
      "url": "http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=550457",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://groups.google.com/group/django-users/browse_thread/thread/15df9e45118dfc51/",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://secunia.com/advisories/36948",
      "tags": [
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      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "http://secunia.com/advisories/36968",
      "tags": [
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      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.debian.org/security/2009/dsa-1905",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.djangoproject.com/weblog/2009/oct/09/security/",
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    {
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    },
    {
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    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/53727",
      "source": "cve@mitre.org"
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      "url": "http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=550457",
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "http://www.debian.org/security/2009/dsa-1905",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    },
    {
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/53727",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Algorithmic complexity vulnerability in the forms library in Django 1.0 before 1.0.4 and 1.1 before 1.1.1 allows remote attackers to cause a denial of service (CPU consumption) via a crafted (1) EmailField (email address) or (2) URLField (URL) that triggers a large amount of backtracking in a regular expression."
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad de complejidad algorítmica en la forma library en Django v1.0 anterior v1.0.4 y v1.1 anterior v1.1.1 permite a atacantes remotos causar una denegación de servicio (consumo CPU( a través de (1) EmailField (dirección email) o (2) URLField (URL)que provoca una gran cantidad de backtracking (vuelta a atrás) en una expresión regular."
    }
  ],
  "lastModified": "2026-06-16T23:12:10.017",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:djangoproject:django:1.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F9023348-07A7-46E8-B45A-CC19563C5961"
            },
            {
              "criteria": "cpe:2.3:a:djangoproject:django:1.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "56846659-96C8-497C-8404-3975E5B6385B"
            }
          ],
          "operator": "OR"
        }
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  ],
  "sourceIdentifier": "cve@mitre.org"
}