DEBIAN-CVE-2021-23336

Advisory lineage Upstream: 1 Downstream: 5
Upstream
CVE-2021-23336
Published: 15 Feb 2021, 13:15
Last modified:28 Apr 2026, 20:21

Vulnerability Summary

Overall Risk (default)
low
24/100
CVSS Score
5.9 MEDIUM
3.1 (osv_debian)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

15 Feb 2021, 13:15
Published
Vulnerability first disclosed
28 Apr 2026, 20:21
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H

Affected Systems

  • debian•pypy3

    < 7.3.3+dfsg-3 | < 7.3.3+dfsg-3 | < 7.3.3+dfsg-3 | < 7.3.3+dfsg-3

  • debian•python-django

    < 2:2.2.19-1 | < 2:2.2.19-1 | < 2:2.2.19-1 | < 2:2.2.19-1

  • debian•python2.7

    < 2.7.18-8+deb11u1

  • debian•python3.9

    < 3.9.2-1

References (1)