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CVE-2021-23336

5.9 medium SSVC exploitation: none Modified
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 12

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 5.9 · python, fedoraproject, debianNVD modified 2026-10-14 12:17

Affected (CPE criteria) 14

  • cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
  • 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:*:*:*:*:*:*:*:*
  • cpe:2.3:a:oracle:communications_offline_mediation_controller:12.0.0.3.0:*:*:*:*:*:*:*
  • cpe:2.3:a:oracle:communications_pricing_design_center:12.0.0.3.0:*:*:*:*:*:*:*
  • cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0.0:*:*:*:*:*:*:*
  • cpe:2.3:o:oracle:zfs_storage_appliance:8.8:*:*:*:*:*:*:*

References 75