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Vulnerability from cleanstart
Published
2026-07-30 07:10
Modified
2026-07-30 09:34
Summary
Security fixes in python3 3.8.8-r0
Details
Package python3 version 3.8.8-r0 fixes 1 vulnerabilities: CVE-2021-23336
References
| URL | Type | |
|---|---|---|
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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 (v2.0.3)
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 | |
|---|---|---|---|
| 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
Credits
Snyk Security Team
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"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/W2LSKBEFI5SYEY5FM6ICZVZM5WRQUCS4/"
},
{
"name": "FEDORA-2021-e22bb0e548",
"tags": [
"vendor-advisory"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/46N6A52EGSXHJYCZWVMBJJIH4NWIV2B5/"
},
{
"name": "FEDORA-2021-e525e48886",
"tags": [
"vendor-advisory"
],
"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",
"tags": [
"mailing-list"
],
"url": "https://lists.debian.org/debian-lts-announce/2021/04/msg00005.html"
},
{
"name": "[debian-lts-announce] 20210417 [SECURITY] [DLA 2628-1] python2.7 security update",
"tags": [
"mailing-list"
],
"url": "https://lists.debian.org/debian-lts-announce/2021/04/msg00015.html"
},
{
"name": "FEDORA-2021-b6b6093b3a",
"tags": [
"vendor-advisory"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/N6VXJZSZ6N64AILJX4CTMACYGQGHHD5C/"
},
{
"name": "GLSA-202104-04",
"tags": [
"vendor-advisory"
],
"url": "https://security.gentoo.org/glsa/202104-04"
},
{
"name": "[airflow-users] 20210501 CVE-2021-28359: Apache Airflow Reflected XSS via Origin Query Argument in URL",
"tags": [
"mailing-list"
],
"url": "https://lists.apache.org/thread.html/ra8ce70088ba291f358e077cafdb14d174b7a1ce9a9d86d1b332d6367%40%3Cusers.airflow.apache.org%3E"
},
{
"name": "[oss-security] 20210501 CVE-2021-28359: Apache Airflow Reflected XSS via Origin Query Argument in URL",
"tags": [
"mailing-list"
],
"url": "http://www.openwall.com/lists/oss-security/2021/05/01/2"
},
{
"name": "[announce] 20210501 Apache Airflow CVE: CVE-2021-28359: Apache Airflow Reflected XSS via Origin Query Argument in URL",
"tags": [
"mailing-list"
],
"url": "https://lists.apache.org/thread.html/rc005f4de9d9b0ba943ceb8ff5a21a5c6ff8a9df52632476698d99432%40%3Cannounce.apache.org%3E"
},
{
"name": "FEDORA-2021-98720f3785",
"tags": [
"vendor-advisory"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SGIY6I4YS3WOXAK4SXKIEOC2G4VZKIR7/"
},
{
"name": "FEDORA-2021-12df7f7382",
"tags": [
"vendor-advisory"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RSLQD5CCM75IZGAMBDGUZEATYU5YSGJ7/"
},
{
"url": "https://www.oracle.com/security-alerts/cpuApr2021.html"
},
{
"url": "https://security.netapp.com/advisory/ntap-20210326-0004/"
},
{
"url": "https://www.oracle.com//security-alerts/cpujul2021.html"
},
{
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
},
{
"url": "https://www.oracle.com/security-alerts/cpujan2022.html"
},
{
"name": "[debian-lts-announce] 20230920 [SECURITY] [DLA 3575-1] python2.7 security update",
"tags": [
"mailing-list"
],
"url": "https://lists.debian.org/debian-lts-announce/2023/09/msg00022.html"
}
],
"title": "Web Cache Poisoning"
}
},
"cveMetadata": {
"assignerOrgId": "bae035ff-b466-4ff4-94d0-fc9efd9e1730",
"assignerShortName": "snyk",
"cveId": "CVE-2021-23336",
"datePublished": "2021-02-15T12:15:20.788Z",
"dateReserved": "2021-01-08T00:00:00.000Z",
"dateUpdated": "2025-12-17T21:16:09.153Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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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.
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