{"cve":"CVE-2021-3116","nvd":{"published":"2021-01-11T05:15:10.987","modified":"2026-06-17T04:04:41.733","status":"Modified","description":"before_upstream_connection in AuthPlugin in http/proxy/auth.py in proxy.py before 2.3.1 accepts incorrect Proxy-Authorization header data because of a boolean confusion (and versus or).","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5},"cwes":["CWE-697"],"references":["https://cardaci.xyz/advisories/2021/01/10/proxy.py-2.3.0-broken-basic-authentication/","https://github.com/abhinavsingh/proxy.py/pull/482/commits/9b00093288237f5073c403f2c4f62acfdfa8ed46","https://pypi.org/project/proxy.py/2.3.1/#history","https://cardaci.xyz/advisories/2021/01/10/proxy.py-2.3.0-broken-basic-authentication/","https://github.com/abhinavsingh/proxy.py/pull/482/commits/9b00093288237f5073c403f2c4f62acfdfa8ed46"],"products":["proxy.py_project:proxy.py"],"source":"nvd","synced_at":"2026-10-19T21:12:09.559580076+00:00"},"epss":{"cve":"CVE-2021-3116","score":0.01694,"percentile":0.77128,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-cmc7-mfmr-xqrx","url":"https://osv.dev/vulnerability/GHSA-cmc7-mfmr-xqrx","summary":"Logic error in authentication in proxy.py","modified":"2024-10-21T21:23:38.100628Z","packages":[{"ecosystem":"PyPI","name":"proxy-py","purl":"pkg:pypi/proxy-py","ranges":["<2.3.1"],"fixed":["2.3.1"]}]},{"id":"PYSEC-2021-46","url":"https://osv.dev/vulnerability/PYSEC-2021-46","summary":"","modified":"2023-11-08T04:05:47.192874Z","packages":[{"ecosystem":"PyPI","name":"proxy-py","purl":"pkg:pypi/proxy-py","ranges":["<2.3.1"],"fixed":["2.3.1"]}]}],"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."]}