{"vulnerability": "CVE-2021-33503", "sightings": [{"uuid": "3427caf4-3723-4393-923a-aca72db323c9", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-33503", "type": "seen", "source": "https://t.me/cibsecurity/25775", "content": "\u203c CVE-2021-33503 \u203c\n\nAn 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.\n\n\ud83d\udcd6 Read\n\nvia \"National Vulnerability Database\".", "creation_timestamp": "2021-06-29T14:28:42.000000Z"}, {"uuid": "fc1c5bdf-f759-4114-99a7-1ff8a7cdb4e7", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "86ecb4e1-bb32-44d5-9f39-8a4673af8385", "vulnerability": "CVE-2021-33503", "type": "seen", "source": "https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0395/", "content": "", "creation_timestamp": "2026-04-02T17:00:00.000000Z"}]}