Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2021-28861

Severity CVSS v4.0:
Pending analysis
Type:
CWE-601 URL Redirection to Untrusted Site ('Open Redirect')
Publication date:
23/08/2022
Last modified:
17/12/2025

Description

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."

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N CVSS v3.1 Severity and Metrics:

Base Score: 7.40 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope (S): Changed
Confidentiality (C): High
Integrity (I): None
Availability (A): None

Base Score 3.x
7.40
Severity 3.x
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:python:python:*:*:*:*:*:*:*:* 3.0.0 (including) 3.7.14 (excluding)
cpe:2.3:a:python:python:*:*:*:*:*:*:*:* 3.8.0 (including) 3.8.14 (excluding)
cpe:2.3:a:python:python:*:*:*:*:*:*:*:* 3.9.0 (including) 3.9.14 (excluding)
cpe:2.3:a:python:python:*:*:*:*:*:*:*:* 3.10.0 (including) 3.10.6 (excluding)
cpe:2.3:a:python:python:3.11.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:python:python:3.11.0:alpha2:*:*:*:*:*:*
cpe:2.3:a:python:python:3.11.0:alpha3:*:*:*:*:*:*
cpe:2.3:a:python:python:3.11.0:alpha4:*:*:*:*:*:*
cpe:2.3:a:python:python:3.11.0:alpha5:*:*:*:*:*:*
cpe:2.3:a:python:python:3.11.0:alpha6:*:*:*:*:*:*
cpe:2.3:a:python:python:3.11.0:alpha7:*:*:*:*:*:*
cpe:2.3:a:python:python:3.11.0:beta1:*:*:*:*:*:*
cpe:2.3:a:python:python:3.11.0:beta2:*:*:*:*:*:*
cpe:2.3:a:python:python:3.11.0:beta3:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools