{"id":"CVE-2021-45699","revision":"1d1ea16d052d40da8b064c04612c623f","records":[{"revision":"1d1ea16d052d40da8b064c04612c623f","observedAt":"2026-10-24T19:17:37.358+00:00","statement":{"source":"nvd","id":"CVE-2021-45699","aliases":[],"title":"An issue was discovered in the ckb crate before 0.40.0 for Rust. Remote attackers may be able to conduct a 51% attack against the Nervos CKB blockchain by triggering an inability to allocate memory for the misbehavior HashMap.","description":"An issue was discovered in the ckb crate before 0.40.0 for Rust. Remote attackers may be able to conduct a 51% attack against the Nervos CKB blockchain by triggering an inability to allocate memory for the misbehavior HashMap.","state":0,"publishedAt":"2021-12-27T00:15:09.623+00:00","modifiedAt":"2026-06-17T04:13:58.337+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"},{"system":"CVSS 2.0 · nvd@nist.gov · Primary","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","score":7.8,"severity":"HIGH"}],"references":["https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/ckb/RUSTSEC-2021-0108.md","https://rustsec.org/advisories/RUSTSEC-2021-0108.html"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-45699","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Modified","weaknesses":["CWE-770"],"productCriteria":["cpe:2.3:a:nervos:ckb:*:*:*:*:*:rust:*:*"],"sourceDates":{"published":"2021-12-27T00:15:09.623","lastModified":"2026-06-17T04:13:58.337"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2021-45699","identifiers":["CVE-2021-45699"]},"retained":false,"historicalAffected":[]}],"coverage":[]}