CVE-2021-23336 (GCVE-0-2021-23336)
Vulnerability from cvelistv5 – Published: 2021-02-15 12:15 – Updated: 2025-12-17 21:16
VLAI
EPSS
VEX
Title
Web Cache Poisoning
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-17 21:16 UTC
CWE
- Web Cache Poisoning
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
37 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| n/a | python/cpython |
Affected:
0 , < unspecified
(custom)
Affected: unspecified , < 3.6.13 (custom) Affected: 3.7.0 , < unspecified (custom) Affected: unspecified , < 3.7.10 (custom) Affected: 3.8.0 , < unspecified (custom) Affected: unspecified , < 3.8.8 (custom) Affected: 3.9.0 , < unspecified (custom) Affected: unspecified , < 3.9.2 (custom) |
Date Public
2021-02-15 00:00
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"value": "El paquete python/cpython desde versiones 0 y anteriores a 3.6.13, desde versiones 3.7.0 y anteriores a 3.7.10, desde versiones 3.8.0 y anteriores a 3.8.8, desde versiones 3.9.0 y anteriores a 3.9.2, son vulnerables al envenenamiento de cach\u00e9 web por medio de urllib.parse.parse_qsl y urllib.parse.parse_qs usando un vector llamado encubrimiento de par\u00e1metros.\u0026#xa0;Cuando el atacante puede separar los par\u00e1metros de la consulta usando un punto y coma (;), pueden causar una diferencia en la interpretaci\u00f3n de la petici\u00f3n entre el proxy (que se ejecuta con la configuraci\u00f3n predeterminada) y el servidor.\u0026#xa0;Esto puede resultar en que las peticiones maliciosas se almacenen en cach\u00e9 como completamente seguras, ya que el proxy normalmente no ver\u00eda el punto y coma como un separador y, por lo tanto, no lo incluir\u00eda en una clave de cach\u00e9 de un par\u00e1metro sin clave"
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"value": "El paquete python/cpython desde versiones 0 y anteriores a 3.6.13, desde versiones 3.7.0 y anteriores a 3.7.10, desde versiones 3.8.0 y anteriores a 3.8.8, desde versiones 3.9.0 y anteriores a 3.9.2, son vulnerables al envenenamiento de cach\u00e9 web por medio de urllib.parse.parse_qsl y urllib.parse.parse_qs usando un vector llamado encubrimiento de par\u00e1metros.\u0026#xa0;Cuando el atacante puede separar los par\u00e1metros de la consulta usando un punto y coma (;), pueden causar una diferencia en la interpretaci\u00f3n de la petici\u00f3n entre el proxy (que se ejecuta con la configuraci\u00f3n predeterminada) y el servidor.\u0026#xa0;Esto puede resultar en que las peticiones maliciosas se almacenen en cach\u00e9 como completamente seguras, ya que el proxy normalmente no ver\u00eda el punto y coma como un separador y, por lo tanto, no lo incluir\u00eda en una clave de cach\u00e9 de un par\u00e1metro sin clave"
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{
"metrics": [
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{
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"attackVector": "NETWORK",
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"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
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"scope": "UNCHANGED",
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"url": "https://snyk.io/blog/cache-poisoning-in-popular-open-source-packages/"
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"name": "[oss-security] 20210219 Django security releases: CVE-2021-23336: Web cache poisoning via ``django.utils.http.limited_parse_qsl()``",
"tags": [
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],
"url": "http://www.openwall.com/lists/oss-security/2021/02/19/4"
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"name": "[debian-lts-announce] 20210219 [SECURITY] [DLA 2569-1] python-django security update",
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},
{
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"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NODWHDIFBQE5RU5PUWUVE47JOT5VCMJ2/"
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},
{
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"tags": [
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],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MNUN5SOMFL2BBKP6ZAICIIUPQKZDMGYO/"
},
{
"name": "[mina-dev] 20210225 [jira] [Created] (FTPSERVER-500) Security vulnerability in common/lib/log4j-1.2.17.jar",
"tags": [
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],
"url": "https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E"
},
{
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],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FONHJIOZOFD7CD35KZL6SVBUTMBPGZGA/"
},
{
"name": "FEDORA-2021-7c1bb32d13",
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"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KJXCMHLY7H3FIYLE4OKDYUILU2CCRUCZ/"
},
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"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3YKKDLXL3UEZ3J426C2XTBS63AHE46SM/"
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"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TFTELUMWZE3KV3JB2H5EE6VFRZFRD5MV/"
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{
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},
{
"name": "FEDORA-2021-5a09621ebb",
"tags": [
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],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/W2LSKBEFI5SYEY5FM6ICZVZM5WRQUCS4/"
},
{
"name": "FEDORA-2021-e22bb0e548",
"tags": [
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"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/46N6A52EGSXHJYCZWVMBJJIH4NWIV2B5/"
},
{
"name": "FEDORA-2021-e525e48886",
"tags": [
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"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LVNH6Z24IG3E67ZCQGGJ46FZB4XFLQNZ/"
},
{
"name": "[debian-lts-announce] 20210405 [SECURITY] [DLA 2619-1] python3.5 security update",
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"url": "https://lists.debian.org/debian-lts-announce/2021/04/msg00005.html"
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{
"name": "[debian-lts-announce] 20210417 [SECURITY] [DLA 2628-1] python2.7 security update",
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"url": "https://lists.debian.org/debian-lts-announce/2021/04/msg00015.html"
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{
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"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/N6VXJZSZ6N64AILJX4CTMACYGQGHHD5C/"
},
{
"name": "GLSA-202104-04",
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{
"name": "[airflow-users] 20210501 CVE-2021-28359: Apache Airflow Reflected XSS via Origin Query Argument in URL",
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"url": "https://security.netapp.com/advisory/ntap-20210326-0004/"
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},
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"datePublished": "2021-02-15T12:15:20.788Z",
"dateReserved": "2021-01-08T00:00:00.000Z",
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"state": "PUBLISHED"
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"dataVersion": "5.2"
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}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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