CVE-2021-23336
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2021
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
Web Cache Poisoning
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
python/cpython
- Vendor
- n/a
- Product
- python/cpython
- Platforms
- Unknown
- Default status
Unknown
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 0 | affected | custom | unspecified | Unavailable | None listed |
| unspecified | affected | custom | 3.6.13 | Unavailable | None listed |
| 3.7.0 | affected | custom | unspecified | Unavailable | None listed |
| unspecified | affected | custom | 3.7.10 | Unavailable | None listed |
| 3.8.0 | affected | custom | unspecified | Unavailable | None listed |
| unspecified | affected | custom | 3.8.8 | Unavailable | None listed |
| 3.9.0 | affected | custom | unspecified | Unavailable | None listed |
| unspecified | affected | custom | 3.9.2 | Unavailable | None listed |