{"id":"CVE-2018-7559","aliases":["GHSA-gr4c-5rq6-cgh3"],"url":"https://o3.security/vulnerability/CVE-2018-7559","summary":"OPC UA applications can allow a remote attacker to determine a Server's private key ","details":"An issue was discovered in OPC UA .NET Standard Stack and Sample Code before GitHub commit 2018-04-12, and OPC UA .NET Legacy Stack and Sample Code before GitHub commit 2018-03-13. A vulnerability in OPC UA applications can allow a remote attacker to determine a Server's private key by sending carefully constructed bad UserIdentityTokens as part of an oracle attack.","published":"2018-06-13T18:29:00.620Z","modified":"2026-08-27T08:14:29.552401Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"NuGet","name":"OPCFoundation.NetStandard.Opc.Ua","fixedVersion":"1.3.352.12"}],"fix":{"url":"https://github.com/OPCFoundation/UA-.NET-Legacy/commit/e2a781b38efb8686d2bd850c2f2372b5c670bc45","label":"OPCFoundation/UA-.NET-Legacy@e2a781b"},"references":[{"type":"WEB","url":"http://www.securityfocus.com/bid/108688"},{"type":"ADVISORY","url":"https://opcfoundation-onlineapplications.org/faq/SecurityBulletins/OPC_Foundation_Security_Bulletin_CVE-2018-7559.pdf"},{"type":"FIX","url":"https://github.com/OPCFoundation/UA-.NET-Legacy/commit/e2a781b38efb8686d2bd850c2f2372b5c670bc45"},{"type":"FIX","url":"https://github.com/OPCFoundation/UA-.NETStandard/commit/ebcf026a54dd0c9052cff009d96d827ac923d150"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-27T08:14:29.552401Z"}}