{"id":"CVE-2021-31819","aliases":["GHSA-hpf7-4c2g-9chf"],"url":"https://o3.security/vulnerability/CVE-2021-31819","summary":"Remote Code Execution in Halibut","details":"In Halibut versions prior to 4.4.7 there is a deserialisation vulnerability that could allow remote code execution on systems that already trust each other based on certificate verification.","published":"2021-09-22T02:15:09.593Z","modified":"2026-07-09T01:25:27.093514Z","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":"NuGet","name":"Halibut","fixedVersion":"4.4.7"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://advisories.octopus.com/adv/2021-08---Remote-Code-Execution-via-Deserialisation-in-the-Halibut-Protocol-%28CVE-2021-31819%29.2250309681.html"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T01:25:27.093514Z"}}