{"id":"CVE-2021-4070","aliases":["GHSA-4cxw-hq44-r344","GO-2022-0550"],"url":"https://o3.security/vulnerability/CVE-2021-4070","summary":"Off-by-one Error in v2fly/v2ray-core","details":"Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0.","published":"2022-02-23T20:15:09.167Z","modified":"2026-07-09T05:45:33.871575Z","cvss":{"score":9.1,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"Go","name":"github.com/v2fly/v2ray-core/v4","fixedVersion":"4.44.0"},{"ecosystem":"Go","name":"github.com/v2fly/v2ray-core","fixedVersion":null}],"fix":{"url":"https://github.com/v2fly/v2ray-core/commit/c1af2bfd7aa59a4482aa7f6ec4b9208c1d350b5c","label":"v2fly/v2ray-core@c1af2bf"},"references":[{"type":"FIX","url":"https://github.com/v2fly/v2ray-core/commit/c1af2bfd7aa59a4482aa7f6ec4b9208c1d350b5c"},{"type":"FIX","url":"https://huntr.dev/bounties/8da19456-4d89-41ef-9781-a41efd6a1877"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T05:45:33.871575Z"}}