cve/2021/CVE-2021-33503.md

CVE-2021-33503

Description

An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.

POC

Reference

• https://www.oracle.com/security-alerts/cpuoct2021.html

Github

• https://github.com/HotDB-Community/HotDB-Engine
• https://github.com/dbrennand/virustotal-python
• https://github.com/engn33r/awesome-redos-security
• https://github.com/fkie-cad/nvd-json-data-feeds
• https://github.com/p-rog/cve-analyser