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.
Published: 2021-06-29
CVSS: 7.5
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Download Exploit for CVE-2021-33503 here:
Use Tor Browser to access .onion links.
Check our team here:
https://wednesfieldacademy.com/exploit-642-cve-2023-1932/
https://wednesfieldacademy.com/exploit-128-cve-2025-9231/
https://wednesfieldacademy.com/exploit-1008-cve-2025-54916/
