CVE-2021-23336
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 products
- Alt Linux, Almalinux, Apache Tomcat, Astra Linux, Centos, Linuxmint, Red Hat, Rocky Linux
- Python
- < 3.6.13, 3.7.10, 3.8.8, 3.9.2
- Fix
- Available
- CVSS 3.1
- 5.9 MEDIUM
- EPSS
- 35.7% (98th percentile)
- Weakness
- CWE-444
- NVD status
- Modified
- Published
- 2021-02-15
No indexed exploits for CVE-2021-23336 yet
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No exploit for CVE-2021-23336 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.