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FKIE_CVE-2020-6817

Vulnerability from fkie_nvd - Published: 2023-02-16 22:15 - Updated: 2026-06-17 03:23
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
bleach.clean behavior parsing style attributes could result in a regular expression denial of service (ReDoS). Calls to bleach.clean with an allowed tag with an allowed style attribute are vulnerable to ReDoS. For example, bleach.clean(..., attributes={'a': ['style']}).
References
security@mozilla.orghttps://bugzilla.mozilla.org/show_bug.cgi?id=1623633Exploit, Issue Tracking
security@mozilla.orghttps://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmmVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.mozilla.org/show_bug.cgi?id=1623633Exploit, Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmmVendor Advisory
Impacted products
Vendor Product Version
mozilla bleach *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Mozilla Bleach",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThan": "3.1.4",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "security@mozilla.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mozilla:bleach:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "21F7320C-9B5F-4B16-896E-2326A8B8B488",
              "versionEndExcluding": "3.1.4",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "bleach.clean behavior parsing style attributes could result in a regular expression denial of service (ReDoS). Calls to bleach.clean with an allowed tag with an allowed style attribute are vulnerable to ReDoS. For example, bleach.clean(..., attributes={\u0027a\u0027: [\u0027style\u0027]})."
    },
    {
      "lang": "es",
      "value": "Los atributos de estilo de an\u00e1lisis del comportamiento de bleach.clean podr\u00edan dar como resultado una denegaci\u00f3n de servicio de expresi\u00f3n regular (ReDoS). Las llamadas a blanqueador.clean con una etiqueta permitida con un atributo de estilo permitido son vulnerables a ReDoS. Por ejemplo, blanqueador.clean(..., atributos={\u0027a\u0027: [\u0027estilo\u0027]})."
    }
  ],
  "id": "CVE-2020-6817",
  "lastModified": "2026-06-17T03:23:51.673",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2020-6817",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-03-19T15:21:19.285722Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2023-02-16T22:15:10.650",
  "references": [
    {
      "source": "security@mozilla.org",
      "tags": [
        "Exploit",
        "Issue Tracking"
      ],
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1623633"
    },
    {
      "source": "security@mozilla.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Issue Tracking"
      ],
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1623633"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm"
    }
  ],
  "sourceIdentifier": "security@mozilla.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1333"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1333"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}



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