Vulnerability-Lookup

ubuntu-cve-2021-21240

Vulnerability from osv_ubuntu

Published

2021-02-08 20:15

Modified

2026-07-14 13:15

Summary

Details

httplib2 is a comprehensive HTTP client library for Python. In httplib2 before version 0.19.0, a malicious server which responds with long series of "\xa0" characters in the "www-authenticate" header may cause Denial of Service (CPU burn while parsing header) of the httplib2 client accessing said server. This is fixed in version 0.19.0 which contains a new implementation of auth headers parsing using the pyparsing library.

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

N/A (UNKNOWN)

low

References

URL

Type

	https://ubuntu.com/security/CVE-2021-21240	REPORT
	https://github.com/httplib2/httplib2/pull/182	REPORT
	https://github.com/httplib2/httplib2/security/adv…	REPORT
	https://pypi.org/project/httplib2	REPORT
	https://www.cve.org/CVERecord?id=CVE-2021-21240	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-httplib2",
            "binary_version": "0.8-2build1"
          },
          {
            "binary_name": "python3-httplib2",
            "binary_version": "0.8-2build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "python-httplib2",
        "purl": "pkg:deb/ubuntu/python-httplib2@0.8-2build1?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.8-2",
        "0.8-2build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-httplib2",
            "binary_version": "0.9.1+dfsg-1"
          },
          {
            "binary_name": "python3-httplib2",
            "binary_version": "0.9.1+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "python-httplib2",
        "purl": "pkg:deb/ubuntu/python-httplib2@0.9.1+dfsg-1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.9+dfsg-2",
        "0.9.1+dfsg-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-httplib2",
            "binary_version": "0.9.2+dfsg-1ubuntu0.3"
          },
          {
            "binary_name": "python3-httplib2",
            "binary_version": "0.9.2+dfsg-1ubuntu0.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "python-httplib2",
        "purl": "pkg:deb/ubuntu/python-httplib2@0.9.2+dfsg-1ubuntu0.3?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.9.2+dfsg-1",
        "0.9.2+dfsg-1ubuntu0.1",
        "0.9.2+dfsg-1ubuntu0.2",
        "0.9.2+dfsg-1ubuntu0.3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-httplib2",
            "binary_version": "0.14.0-1ubuntu1"
          },
          {
            "binary_name": "python3-httplib2",
            "binary_version": "0.14.0-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "python-httplib2",
        "purl": "pkg:deb/ubuntu/python-httplib2@0.14.0-1ubuntu1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.11.3-2",
        "0.11.3-2build1",
        "0.14.0-1",
        "0.14.0-1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-httplib2",
            "binary_version": "0.20.2-2ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "python-httplib2",
        "purl": "pkg:deb/ubuntu/python-httplib2@0.20.2-2ubuntu0.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.18.1-3ubuntu1",
        "0.20.2-2",
        "0.20.2-2ubuntu0.1"
      ]
    }
  ],
  "aliases": [],
  "details": "httplib2 is a comprehensive HTTP client library for Python. In httplib2 before version 0.19.0, a malicious server which responds with long series of \"\\xa0\" characters in the \"www-authenticate\" header may cause Denial of Service (CPU burn while parsing header) of the httplib2 client accessing said server. This is fixed in version 0.19.0 which contains a new implementation of auth headers parsing using the pyparsing library.",
  "id": "UBUNTU-CVE-2021-21240",
  "modified": "2026-07-14T13:15:25Z",
  "published": "2021-02-08T20:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-21240"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/httplib2/httplib2/pull/182"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/httplib2/httplib2/security/advisories/GHSA-93xj-8mrv-444m"
    },
    {
      "type": "REPORT",
      "url": "https://pypi.org/project/httplib2"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-21240"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "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": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-21240"
  ]
}

CVE-2021-21240 (GCVE-0-2021-21240)

Vulnerability from cvelistv5 – Published: 2021-02-08 19:45 – Updated: 2024-08-03 18:09

Title

Regular Expression Denial of Service in httplib2

Summary

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

GitHub_M

References

4 references

URL	Tags
https://github.com/httplib2/httplib2/security/adv…	x_refsource_CONFIRM
https://github.com/httplib2/httplib2/pull/182	x_refsource_MISC
https://github.com/httplib2/httplib2/commit/bd9ee…	x_refsource_MISC
https://pypi.org/project/httplib2	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
httplib2	httplib2	Affected: < 0.19.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T18:09:14.827Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
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              "x_transferred"
            ],
            "url": "https://github.com/httplib2/httplib2/security/advisories/GHSA-93xj-8mrv-444m"
          },
          {
            "tags": [
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            ],
            "url": "https://github.com/httplib2/httplib2/pull/182"
          },
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            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/httplib2/httplib2/commit/bd9ee252c8f099608019709e22c0d705e98d26bc"
          },
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            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://pypi.org/project/httplib2"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "httplib2",
          "vendor": "httplib2",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.19.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "httplib2 is a comprehensive HTTP client library for Python. In httplib2 before version 0.19.0, a malicious server which responds with long series of \"\\xa0\" characters in the \"www-authenticate\" header may cause Denial of Service (CPU burn while parsing header) of the httplib2 client accessing said server. This is fixed in version 0.19.0 which contains a new implementation of auth headers parsing using the pyparsing library."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
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            "confidentialityImpact": "NONE",
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400 Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
            }
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        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-02-08T19:45:19.000Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "tags": [
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          "url": "https://github.com/httplib2/httplib2/security/advisories/GHSA-93xj-8mrv-444m"
        },
        {
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          "url": "https://github.com/httplib2/httplib2/pull/182"
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        },
        {
          "tags": [
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          "url": "https://pypi.org/project/httplib2"
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      ],
      "source": {
        "advisory": "GHSA-93xj-8mrv-444m",
        "discovery": "UNKNOWN"
      },
      "title": "Regular Expression Denial of Service in httplib2",
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security-advisories@github.com",
          "ID": "CVE-2021-21240",
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        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "httplib2",
                      "version": {
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                          {
                            "version_value": "\u003c 0.19.0"
                          }
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    "dateReserved": "2020-12-22T00:00:00.000Z",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

ubuntu-cve-2021-21240

Vulnerability from osv_ubuntu

CVE-2021-21240 (GCVE-0-2021-21240)

Tags

Sightings

Nomenclature