CVE-2021-233365.9MediumCWE-444

CVE-2021-23336: Web Cache Poisoning

Python · python/cpython

Vendor fix available · Affected: python/cpython · Exploitation: likely to be exploited (10% or more)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

41.1%probability of exploitation in the next 30 days

98th percentile

050100

Higher than 98% of scored CVEs

5.9MediumCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.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.

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

python/cpython0; before 3.6.13; 3.7.0; before 3.7.10; 3.8.0; before 3.8.8 and 2 more

On the Atlas

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Open the Atlas

Exploitation: Likely to be exploited (10% or more). EPSS gives it a 10% or higher chance of exploitation in the next 30 days.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Inconsistent Interpretation of HTTP Requests · Injection and Smuggling
Vendor: Python
Published: February 2021
Band: Likely to be exploited (10% or more), February 2021

CoverageNo articles yet

No CyberSIXT article names CVE-2021-23336 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.

References

26 more references are in the CVE record.