{"id":"CVE-2021-27378","aliases":["GHSA-w7j2-35mf-95p7","RUSTSEC-2021-0023"],"url":"https://o3.security/vulnerability/CVE-2021-27378","summary":"Incorrect check on buffer length in rand_core","details":"An issue was discovered in the rand_core crate before 0.6.2 for Rust. Because read_u32_into and read_u64_into mishandle certain buffer-length checks, a random number generator may be seeded with too little data.","published":"2021-02-18T04:15:11.823Z","modified":"2026-07-08T23:59:00.584167Z","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":null,"affectedPackages":[{"ecosystem":"crates.io","name":"rand_core","fixedVersion":"0.6.2"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://rustsec.org/advisories/RUSTSEC-2021-0023.html"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T23:59:00.584167Z"}}