{"id":"CVE-2019-8849","aliases":["GHSA-frg3-gpcx-968f"],"url":"https://o3.security/vulnerability/CVE-2019-8849","summary":"SwiftNIO SSL arbitrary code execution vulnerability","details":"The issue was addressed by signaling that an executable stack is not required. This issue is fixed in SwiftNIO SSL 2.4.1. A SwiftNIO application using TLS may be able to execute arbitrary code.","published":"2019-12-18T18:15:44.990Z","modified":"2026-08-07T16:35:44.032963Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"SwiftURL","name":"github.com/apple/swift-nio-ssl","fixedVersion":"2.4.1"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://support.apple.com/HT210772"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T16:35:44.032963Z"}}