{"cve":"CVE-2021-33880","nvd":{"published":"2021-06-06T15:15:07.407","modified":"2026-06-17T03:55:19.517","status":"Modified","description":"The aaugustin websockets library before 9.1 for Python has an Observable Timing Discrepancy on servers when HTTP Basic Authentication is enabled with basic_auth_protocol_factory(credentials=...). An attacker may be able to guess a password via a timing attack.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","score":5.9},"cwes":["CWE-203"],"references":["https://github.com/aaugustin/websockets/commit/547a26b685d08cac0aa64e5e65f7867ac0ea9bc0","https://www.oracle.com/security-alerts/cpuapr2022.html","https://www.oracle.com/security-alerts/cpujan2022.html","https://github.com/aaugustin/websockets/commit/547a26b685d08cac0aa64e5e65f7867ac0ea9bc0","https://www.oracle.com/security-alerts/cpuapr2022.html"],"products":["oracle:communications_cloud_native_core_policy","oracle:communications_cloud_native_core_security_edge_protection_proxy","oracle:communications_cloud_native_core_service_communication_proxy","oracle:communications_cloud_native_core_unified_data_repository","websockets_project:websockets"],"source":"nvd","synced_at":"2026-10-19T21:20:07.141963181+00:00"},"epss":{"cve":"CVE-2021-33880","score":0.02265,"percentile":0.83011,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-8ch4-58qp-g3mp","url":"https://osv.dev/vulnerability/GHSA-8ch4-58qp-g3mp","summary":"Observable Timing Discrepancy in aaugustin websockets library","modified":"2024-11-19T18:25:23.133425Z","packages":[{"ecosystem":"PyPI","name":"websockets","purl":"pkg:pypi/websockets","ranges":["<9.1"],"fixed":["9.1"]}]},{"id":"PYSEC-2021-95","url":"https://osv.dev/vulnerability/PYSEC-2021-95","summary":"","modified":"2023-11-08T04:06:06.475813Z","packages":[{"ecosystem":"PyPI","name":"websockets","purl":"pkg:pypi/websockets","ranges":["<9.1"],"fixed":["9.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}