Vulnerability-Lookup

CVE-2021-28861 (GCVE-0-2021-28861)

Vulnerability from cvelistv5 – Published: 2022-08-23 00:00 – Updated: 2025-12-17 21:30 Disputed

Summary

Python 3.x through 3.10 has an open redirection vulnerability in lib/http/server.py due to no protection against multiple (/) at the beginning of URI path which may leads to information disclosure. NOTE: this is disputed by a third party because the http.server.html documentation page states "Warning: http.server is not recommended for production. It only implements basic security checks."

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-04-17 01:59 UTC

CWE

n/a
CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

Assigner

mitre mitre root

References

20 references

URL	Tags
https://bugs.python.org/issue43223
https://github.com/python/cpython/pull/93879
https://github.com/python/cpython/pull/24848
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://security.gentoo.org/glsa/202305-02	vendor-advisory
https://lists.debian.org/debian-lts-announce/2024…
https://lists.debian.org/debian-lts-announce/2024…

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OESA-2022-1879 (CVE-2021-28861)

Vulnerability from osv_openeuler – Published: 2022-09-02 11:05 – Updated: 2026-08-06 11:05 – Source website

Summary

python3 security update

Details

Python combines remarkable power with very clear syntax. It has modules,classes, exceptions, very high level dynamic data types, and dynamic typing. There are interfaces to many system calls and libraries, as well as to various windowing systems. New built-in modules are easily written in C or C++ (or other languages, depending on the chosen implementation).Python is also usable as an extension language for applications written in other languages that need easy-to-use scripting or automation interfaces.This package Provides python version 3.

Security Fix(es):

** DISPUTED ** Python 3.x through 3.10 has an open redirection vulnerability in lib/http/server.py due to no protection against multiple (/) at the beginning of URI path which may leads to information disclosure. NOTE: this is disputed by a third party because the http.server.html documentation page states "Warning: http.server is not recommended for production. It only implements basic security checks."(CVE-2021-28861)

Severity

7.4 (High)


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

References

URL

Type

	https://www.openeuler.org/en/security/safety-bull…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-28861	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "python3-debug-3.7.9-25.oe1.aarch64.rpm",
          "python3-debugsource-3.7.9-25.oe1.aarch64.rpm",
          "python3-3.7.9-25.oe1.aarch64.rpm",
          "python3-devel-3.7.9-25.oe1.aarch64.rpm",
          "python3-debuginfo-3.7.9-25.oe1.aarch64.rpm"
        ],
        "noarch": [
          "python3-help-3.7.9-25.oe1.noarch.rpm"
        ],
        "src": [
          "python3-3.7.9-25.oe1.src.rpm"
        ],
        "x86_64": [
          "python3-debug-3.7.9-25.oe1.x86_64.rpm",
          "python3-debugsource-3.7.9-25.oe1.x86_64.rpm",
          "python3-debuginfo-3.7.9-25.oe1.x86_64.rpm",
          "python3-devel-3.7.9-25.oe1.x86_64.rpm",
          "python3-3.7.9-25.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP1",
        "name": "python3",
        "purl": "pkg:rpm/openEuler/python3\u0026distro=openEuler-20.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.7.9-25.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "python3-debug-3.7.9-26.oe1.aarch64.rpm",
          "python3-3.7.9-26.oe1.aarch64.rpm",
          "python3-devel-3.7.9-26.oe1.aarch64.rpm",
          "python3-debugsource-3.7.9-26.oe1.aarch64.rpm",
          "python3-debuginfo-3.7.9-26.oe1.aarch64.rpm"
        ],
        "noarch": [
          "python3-help-3.7.9-26.oe1.noarch.rpm"
        ],
        "src": [
          "python3-3.7.9-26.oe1.src.rpm"
        ],
        "x86_64": [
          "python3-debugsource-3.7.9-26.oe1.x86_64.rpm",
          "python3-debuginfo-3.7.9-26.oe1.x86_64.rpm",
          "python3-devel-3.7.9-26.oe1.x86_64.rpm",
          "python3-debug-3.7.9-26.oe1.x86_64.rpm",
          "python3-3.7.9-26.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP3",
        "name": "python3",
        "purl": "pkg:rpm/openEuler/python3\u0026distro=openEuler-20.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.7.9-26.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "python3-3.9.9-13.oe2203.aarch64.rpm",
          "python3-debug-3.9.9-13.oe2203.aarch64.rpm",
          "python3-debugsource-3.9.9-13.oe2203.aarch64.rpm",
          "python3-devel-3.9.9-13.oe2203.aarch64.rpm",
          "python3-unversioned-command-3.9.9-13.oe2203.aarch64.rpm",
          "python3-debuginfo-3.9.9-13.oe2203.aarch64.rpm"
        ],
        "noarch": [
          "python3-help-3.9.9-13.oe2203.noarch.rpm"
        ],
        "src": [
          "python3-3.9.9-13.oe2203.src.rpm"
        ],
        "x86_64": [
          "python3-debugsource-3.9.9-13.oe2203.x86_64.rpm",
          "python3-debuginfo-3.9.9-13.oe2203.x86_64.rpm",
          "python3-devel-3.9.9-13.oe2203.x86_64.rpm",
          "python3-debug-3.9.9-13.oe2203.x86_64.rpm",
          "python3-3.9.9-13.oe2203.x86_64.rpm",
          "python3-unversioned-command-3.9.9-13.oe2203.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS",
        "name": "python3",
        "purl": "pkg:rpm/openEuler/python3\u0026distro=openEuler-22.03-LTS"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.9.9-13.oe2203"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "Python combines remarkable power with very clear syntax. It has modules,classes, exceptions, very high level dynamic data types, and dynamic typing. There are interfaces to many system calls and libraries, as well as to various windowing systems. New built-in modules are easily written in C or C++ (or other languages, depending on the chosen implementation).Python is also usable as an extension language for applications written in other languages that need easy-to-use scripting or automation interfaces.This package Provides python version 3.\r\n\r\nSecurity Fix(es):\r\n\r\n** DISPUTED ** Python 3.x through 3.10 has an open redirection vulnerability in lib/http/server.py due to no protection against multiple (/) at the beginning of URI path which may leads to information disclosure. NOTE: this is disputed by a third party because the http.server.html documentation page states \u0026quot;Warning: http.server is not recommended for production. It only implements basic security checks.\u0026quot;(CVE-2021-28861)",
  "id": "OESA-2022-1879",
  "modified": "2026-08-06T11:05:09Z",
  "published": "2022-09-02T11:05:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2022-1879"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-28861"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "python3 security update",
  "upstream": [
    "CVE-2021-28861"
  ]
}

OPENSUSE-SU-2024:12297-1

Vulnerability from csaf_opensuse - Published: 2024-06-15 00:00 - Updated: 2024-06-15 00:00

Summary

python310-3.10.6-3.1 on GA media

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2021-28861.

CVE-2021-28861

7.4 (High)


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

Recommended: 24 products

Open the full advisory

OPENSUSE-SU-2024:12300-1

Vulnerability from csaf_opensuse - Published: 2024-06-15 00:00 - Updated: 2024-06-15 00:00

Summary

python38-3.8.13-4.1 on GA media

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2021-28861.

CVE-2021-28861

7.4 (High)


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

Recommended: 24 products

Open the full advisory

OPENSUSE-SU-2024:12301-1

Vulnerability from csaf_opensuse - Published: 2024-06-15 00:00 - Updated: 2024-06-15 00:00

Summary

python39-3.9.13-5.1 on GA media

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2021-28861.

CVE-2021-28861

7.4 (High)


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

Recommended: 24 products

Open the full advisory

OPENSUSE-SU-2024:12321-1

Vulnerability from csaf_opensuse - Published: 2024-06-15 00:00 - Updated: 2024-06-15 00:00

Summary

python-2.7.18-23.1 on GA media

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2021-28861.

CVE-2021-28861

7.4 (High)


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

Recommended: 28 products

Open the full advisory

RHSA-2022:6766

Vulnerability from csaf_redhat - Published: 2022-10-03 15:25 - Updated: 2026-06-30 03:17

Summary

Red Hat Security Advisory: rh-python38-python security update

Severity

Moderate

Scope

3 vulnerabilities in this advisory, including CVE-2021-28861.

CVE-2021-28861

A vulnerability was found in python. This security flaw causes an open redirection vulnerability in lib/http/server.py due to no protection against multiple (/) at the beginning of the URI path. This issue may lead to information disclosure.

7.4 (High)


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

Fixed: 38 products

https://access.redhat.com/errata/RHSA-2022:6766

Open the full advisory

RHSA-2022:8353

Vulnerability from csaf_redhat - Published: 2022-11-15 10:30 - Updated: 2026-06-30 03:17

Summary

Red Hat Security Advisory: python3.9 security, bug fix, and enhancement update

Severity

Moderate

Scope

2 vulnerabilities in this advisory, including CVE-2021-28861.

CVE-2021-28861

7.4 (High)


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

Fixed: 67 products

https://access.redhat.com/errata/RHSA-2022:8353

Open the full advisory

RHSA-2022_6766

Vulnerability from csaf_redhat - Published: 2022-10-03 15:25 - Updated: 2024-12-03 11:22

Summary

Red Hat Security Advisory: rh-python38-python security update

Severity

Moderate

Scope

3 vulnerabilities in this advisory, including CVE-2021-28861.

CVE-2021-28861

7.4 (High)


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

Fixed: 54 products

https://access.redhat.com/errata/RHSA-2022:6766

Open the full advisory

RHSA-2022_8353

Vulnerability from csaf_redhat - Published: 2022-11-15 10:30 - Updated: 2024-12-03 11:23

Summary

Red Hat Security Advisory: python3.9 security, bug fix, and enhancement update

Severity

Moderate

Scope

2 vulnerabilities in this advisory, including CVE-2021-28861.

CVE-2021-28861

7.4 (High)


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

Fixed: 141 products

https://access.redhat.com/errata/RHSA-2022:8353

Open the full advisory

RHSA-2023:0833

Vulnerability from csaf_redhat - Published: 2023-02-21 11:33 - Updated: 2026-06-28 09:12

Summary

Red Hat Security Advisory: python3 security update

Severity

Moderate

Scope

3 vulnerabilities in this advisory, including CVE-2021-28861.

CVE-2021-28861

7.4 (High)


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

Fixed: 56 products

https://access.redhat.com/errata/RHSA-2023:0833

Open the full advisory

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2021-28861 (GCVE-0-2021-28861)

OESA-2022-1879 (CVE-2021-28861)

Tags

Sightings

Nomenclature

Related by attack behaviour