{"cve":"CVE-2021-27378","nvd":{"published":"2021-02-18T04:15:11.823","modified":"2026-06-17T03:44:44.323","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-131"],"references":["https://rustsec.org/advisories/RUSTSEC-2021-0023.html","https://rustsec.org/advisories/RUSTSEC-2021-0023.html"],"products":["rand_core_project:rand_core"],"source":"nvd","synced_at":"2026-10-19T21:15:50.279857260+00:00"},"epss":{"cve":"CVE-2021-27378","score":0.01238,"percentile":0.69112,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-w7j2-35mf-95p7","url":"https://osv.dev/vulnerability/GHSA-w7j2-35mf-95p7","summary":"Incorrect check on buffer length in rand_core","modified":"2023-11-08T04:05:24.551510Z","packages":[{"ecosystem":"crates.io","name":"rand_core","purl":"pkg:cargo/rand_core","ranges":[">=0.6.0 <0.6.2"],"fixed":["0.6.2"]}]},{"id":"RUSTSEC-2021-0023","url":"https://osv.dev/vulnerability/RUSTSEC-2021-0023","summary":"Incorrect check on buffer length when seeding RNGs","modified":"2023-11-08T04:05:24.551510Z","packages":[{"ecosystem":"crates.io","name":"rand_core","purl":"pkg:cargo/rand_core","ranges":[">=0.6.0 <0.6.2"],"fixed":["0.6.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}