CVE-2021-23336

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

15/02/2021

Last modified:

17/12/2025

Description

The package python/cpython from 0 and before 3.6.13, from 3.7.0 and before 3.7.10, from 3.8.0 and before 3.8.8, from 3.9.0 and before 3.9.2 are vulnerable to Web Cache Poisoning via urllib.parse.parse_qsl and urllib.parse.parse_qs by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon (;), they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server. This can result in malicious requests being cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and therefore would not include it in a cache key of an unkeyed parameter.

Impact

Vector 3.x

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

Base Score: 5.90 MEDIUM
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H

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

Base Score 3.x

5.90

Severity 3.x

MEDIUM

Vector 2.0

AV:N/AC:H/Au:N/C:N/I:P/A:P CVSS v2.0 Severity and Metrics:

Base Score: 4.00 MEDIUM
Vector: AV:N/AC:H/Au:N/C:N/I:P/A:P

Attack Vector (AV): Network
Attack Complexity (AC): High
Authentication (Au): None
Confidentiality (C): None
Integrity (I): Physical
Availability (A): Physical

Base Score 2.0

4.00

Severity 2.0

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:python:python::::::::		3.6.13 (excluding)
cpe:2.3:a:python:python::::::::	3.7.0 (including)	3.7.10 (excluding)
cpe:2.3:a:python:python::::::::	3.8.0 (including)	3.8.8 (excluding)
cpe:2.3:a:python:python::::::::	3.9.0 (including)	3.9.2 (excluding)
cpe:2.3:o:fedoraproject:fedora:32:::::::*
cpe:2.3:o:fedoraproject:fedora:33:::::::*
cpe:2.3:o:fedoraproject:fedora:34:::::::*
cpe:2.3:o:debian:debian_linux:9.0:::::::*
cpe:2.3:a:netapp:cloud_backup:-:::::::*
cpe:2.3:a:netapp:inventory_collect_tool:-:::::::*
cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:::::::*
cpe:2.3:a:netapp:snapcenter:-:::::::*
cpe:2.3:a:djangoproject:django::::::::	2.2 (including)	2.2.19 (excluding)
cpe:2.3:a:djangoproject:django::::::::	3.0 (including)	3.0.13 (excluding)
cpe:2.3:a:djangoproject:django::::::::	3.1 (including)	3.1.7 (excluding)

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

CVE-2021-23336

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools