FKIE_CVE-2021-32837

Vulnerability from fkie_nvd - Published: 2023-01-17 22:15 - Updated: 2026-06-17 03:53
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
mechanize, a library for automatically interacting with HTTP web servers, contains a regular expression that is vulnerable to regular expression denial of service (ReDoS) prior to version 0.4.6. If a web server responds in a malicious way, then mechanize could crash. Version 0.4.6 has a patch for the issue.
References
security-advisories@github.comhttps://github.com/python-mechanize/mechanize/blob/3acb1836f3fd8edc5a758a417dd46b53832ae3b5/mechanize/_urllib2_fork.py#L878-L879Exploit, Third Party Advisory
security-advisories@github.comhttps://github.com/python-mechanize/mechanize/commit/dd05334448e9f39814bab044d2eaa5ef69b410d6Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/python-mechanize/mechanize/releases/tag/v0.4.6Third Party Advisory
security-advisories@github.comhttps://lists.debian.org/debian-lts-announce/2023/06/msg00022.html
security-advisories@github.comhttps://securitylab.github.com/advisories/GHSL-2021-108-python-mechanize-mechanize/Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/python-mechanize/mechanize/blob/3acb1836f3fd8edc5a758a417dd46b53832ae3b5/mechanize/_urllib2_fork.py#L878-L879Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/python-mechanize/mechanize/commit/dd05334448e9f39814bab044d2eaa5ef69b410d6Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/python-mechanize/mechanize/releases/tag/v0.4.6Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2023/06/msg00022.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/12/msg00028.html
af854a3a-2127-422b-91ae-364da2661108https://securitylab.github.com/advisories/GHSL-2021-108-python-mechanize-mechanize/Exploit, Third Party Advisory
Impacted products
Vendor Product Version
mechanize_project mechanize *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "mechanize",
          "vendor": "python-mechanize",
          "versions": [
            {
              "lessThan": "0.4.6",
              "status": "affected",
              "version": "0.4.6",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mechanize_project:mechanize:*:*:*:*:*:python:*:*",
              "matchCriteriaId": "29D79742-1F31-48EC-B67A-A49B3B73EADE",
              "versionEndExcluding": "0.4.6",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "mechanize, a library for automatically interacting with HTTP web servers, contains a regular expression that is vulnerable to regular expression denial of service (ReDoS) prior to version 0.4.6. If a web server responds in a malicious way, then mechanize could crash. Version 0.4.6 has a patch for the issue."
    },
    {
      "lang": "es",
      "value": "mechanize, una librer\u00eda para interactuar autom\u00e1ticamente con servidores web HTTP, contiene una expresi\u00f3n regular que es vulnerable a la denegaci\u00f3n de servicio de expresi\u00f3n regular (ReDoS) antes de la versi\u00f3n 0.4.6. Si un servidor web responde de forma maliciosa, mechanize podr\u00eda fallar. La versi\u00f3n 0.4.6 tiene un parche para este problema."
    }
  ],
  "id": "CVE-2021-32837",
  "lastModified": "2026-06-17T03:53:43.880",
  "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": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "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"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-32837",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-03-10T21:02:11.874134Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2023-01-17T22:15:10.533",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/python-mechanize/mechanize/blob/3acb1836f3fd8edc5a758a417dd46b53832ae3b5/mechanize/_urllib2_fork.py#L878-L879"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/python-mechanize/mechanize/commit/dd05334448e9f39814bab044d2eaa5ef69b410d6"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/python-mechanize/mechanize/releases/tag/v0.4.6"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://lists.debian.org/debian-lts-announce/2023/06/msg00022.html"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://securitylab.github.com/advisories/GHSL-2021-108-python-mechanize-mechanize/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/python-mechanize/mechanize/blob/3acb1836f3fd8edc5a758a417dd46b53832ae3b5/mechanize/_urllib2_fork.py#L878-L879"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/python-mechanize/mechanize/commit/dd05334448e9f39814bab044d2eaa5ef69b410d6"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/python-mechanize/mechanize/releases/tag/v0.4.6"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2023/06/msg00022.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2025/12/msg00028.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://securitylab.github.com/advisories/GHSL-2021-108-python-mechanize-mechanize/"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1333"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}


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