{"id":"CVE-2020-29457","aliases":["GHSA-mjww-934m-h4jw"],"url":"https://o3.security/vulnerability/CVE-2020-29457","summary":"Improper Certificate Validation in OPCFoundation.NetStandard.Opc.Ua.Core","details":"A Privilege Elevation vulnerability in OPC UA .NET Standard Stack 1.4.363.107 could allow a rogue application to establish a secure connection.","published":"2021-02-16T20:15:15.707Z","modified":"2026-07-08T20:42:35.483591Z","cvss":{"score":4.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N"},"epss":{"score":0.00311,"percentile":0.23982,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"NuGet","name":"OPCFoundation.NetStandard.Opc.Ua.Core","fixedVersion":"1.4.365.10"}],"fix":{"url":"https://github.com/OPCFoundation/UA-.NETStandard/pull/1229","label":"OPCFoundation/UA-.NETStandard#1229"},"references":[{"type":"ADVISORY","url":"https://github.com/OPCFoundation/UA-.NETStandard"},{"type":"ADVISORY","url":"https://www.nuget.org/packages/OPCFoundation.NetStandard.Opc.Ua/"},{"type":"FIX","url":"https://opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2020-29457.pdf"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-29457"},{"type":"WEB","url":"https://github.com/OPCFoundation/UA-.NETStandard/pull/1229"},{"type":"WEB","url":"https://github.com/OPCFoundation/UA-.NETStandard/pull/1229/commits/d815cfb972bd668c1b6e461f6ff97519d6b26f25"},{"type":"WEB","url":"https://www.nuget.org/packages/OPCFoundation.NetStandard.Opc.Ua"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T20:42:35.483591Z"}}