vuln-ubuntu/data/osv/usn/USN-5201-1.json

{
  "schema_version": "1.7.0",
  "id": "USN-5201-1",
  "summary": "python3.8, python3.9 vulnerabilities",
  "details": "\nIt was discovered that the Python urllib http client could enter into an infinite \nloop when incorrectly handling certain server responses (100 Continue response). \nSpecially crafted traffic from a malicious HTTP server could cause a denial of \nservice (Dos) condition for a client.\n\n",
  "aliases": [],
  "upstream": [
    "UBUNTU-CVE-2021-3737"
  ],
  "related": [],
  "published": "2021-12-17T15:10:44Z",
  "modified": "2026-04-22T07:37:00Z",
  "affected": [
    {
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "python3.8",
        "purl": "pkg:deb/ubuntu/python3.8@3.8.10-0ubuntu1~20.04.2?arch=source&distro=focal"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.8.10-0ubuntu1~20.04.2"
            }
          ]
        }
      ],
      "versions": [
        "3.8.0-1",
        "3.8.0-2",
        "3.8.0-3",
        "3.8.0-4",
        "3.8.0-5",
        "3.8.1-2ubuntu3",
        "3.8.2~rc1-1ubuntu1",
        "3.8.2-1",
        "3.8.2-1ubuntu1",
        "3.8.2-1ubuntu1.1",
        "3.8.2-1ubuntu1.2",
        "3.8.5-1~20.04",
        "3.8.5-1~20.04.2",
        "3.8.5-1~20.04.3",
        "3.8.10-0ubuntu1~20.04",
        "3.8.10-0ubuntu1~20.04.1"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "idle-python3.8",
            "binary_version": "3.8.10-0ubuntu1~20.04.2"
          },
          {
            "binary_name": "libpython3.8",
            "binary_version": "3.8.10-0ubuntu1~20.04.2"
          },
          {
            "binary_name": "libpython3.8-minimal",
            "binary_version": "3.8.10-0ubuntu1~20.04.2"
          },
          {
            "binary_name": "libpython3.8-stdlib",
            "binary_version": "3.8.10-0ubuntu1~20.04.2"
          },
          {
            "binary_name": "libpython3.8-testsuite",
            "binary_version": "3.8.10-0ubuntu1~20.04.2"
          },
          {
            "binary_name": "python3.8",
            "binary_version": "3.8.10-0ubuntu1~20.04.2"
          },
          {
            "binary_name": "python3.8-examples",
            "binary_version": "3.8.10-0ubuntu1~20.04.2"
          },
          {
            "binary_name": "python3.8-full",
            "binary_version": "3.8.10-0ubuntu1~20.04.2"
          },
          {
            "binary_name": "python3.8-minimal",
            "binary_version": "3.8.10-0ubuntu1~20.04.2"
          },
          {
            "binary_name": "python3.8-venv",
            "binary_version": "3.8.10-0ubuntu1~20.04.2"
          }
        ],
        "availability": "No subscription required"
      },
      "database_specific": {
        "cves_map": {
          "ecosystem": "Ubuntu:20.04:LTS",
          "cves": [
            {
              "id": "CVE-2021-3737",
              "severity": [
                {
                  "type": "CVSS_V3",
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                  "type": "CVSS_V3",
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                  "type": "Ubuntu",
                  "score": "medium"
                }
              ]
            }
          ]
        }
      }
    },
    {
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "python3.9",
        "purl": "pkg:deb/ubuntu/python3.9@3.9.5-3ubuntu0~20.04.1?arch=source&distro=focal"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.9.5-3ubuntu0~20.04.1"
            }
          ]
        }
      ],
      "versions": [
        "3.9.0~rc1-1~20.04",
        "3.9.0-5~20.04",
        "3.9.5-3~20.04.1"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "idle-python3.9",
            "binary_version": "3.9.5-3ubuntu0~20.04.1"
          },
          {
            "binary_name": "libpython3.9",
            "binary_version": "3.9.5-3ubuntu0~20.04.1"
          },
          {
            "binary_name": "libpython3.9-minimal",
            "binary_version": "3.9.5-3ubuntu0~20.04.1"
          },
          {
            "binary_name": "libpython3.9-stdlib",
            "binary_version": "3.9.5-3ubuntu0~20.04.1"
          },
          {
            "binary_name": "libpython3.9-testsuite",
            "binary_version": "3.9.5-3ubuntu0~20.04.1"
          },
          {
            "binary_name": "python3.9",
            "binary_version": "3.9.5-3ubuntu0~20.04.1"
          },
          {
            "binary_name": "python3.9-examples",
            "binary_version": "3.9.5-3ubuntu0~20.04.1"
          },
          {
            "binary_name": "python3.9-full",
            "binary_version": "3.9.5-3ubuntu0~20.04.1"
          },
          {
            "binary_name": "python3.9-minimal",
            "binary_version": "3.9.5-3ubuntu0~20.04.1"
          },
          {
            "binary_name": "python3.9-venv",
            "binary_version": "3.9.5-3ubuntu0~20.04.1"
          }
        ],
        "availability": "No subscription required"
      },
      "database_specific": {
        "cves_map": {
          "ecosystem": "Ubuntu:20.04:LTS",
          "cves": [
            {
              "id": "CVE-2021-3737",
              "severity": [
                {
                  "type": "CVSS_V3",
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                  "type": "CVSS_V3",
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                  "type": "Ubuntu",
                  "score": "medium"
                }
              ]
            }
          ]
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5201-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3737"
    }
  ]
}