Vulnerability from bitnami_vulndb
Published
2024-03-06 11:06
Modified
2025-11-06 13:25
Summary
Details

There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the server to the client. The greatest threat that this flaw poses is to application availability.

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "python",
        "purl": "pkg:bitnami/python"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.6.14"
            },
            {
              "introduced": "3.7.0"
            },
            {
              "fixed": "3.7.11"
            },
            {
              "introduced": "3.8.0"
            },
            {
              "fixed": "3.8.10"
            },
            {
              "introduced": "3.9.0"
            },
            {
              "fixed": "3.9.5"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-3733"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*",
      "cpe:2.3:a:python:python:3.10.0:-:*:*:*:*:*:*"
    ],
    "severity": "Medium"
  },
  "details": "There\u0027s a flaw in urllib\u0027s AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the server to the client. The greatest threat that this flaw poses is to application availability.",
  "id": "BIT-python-2021-3733",
  "modified": "2025-11-06T13:25:46.476Z",
  "published": "2024-03-06T11:06:14.679Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://bugs.python.org/issue43075"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1995234"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/7215d1ae25525c92b026166f9d5cac85fb"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/pull/24391"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20220407-0001/"
    },
    {
      "type": "WEB",
      "url": "https://ubuntu.com/security/CVE-2021-3733"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3733"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html"
    }
  ],
  "schema_version": "1.5.0"
}


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Detection rules are retrieved from Rulezet.