{"id":"CVE-2021-45709","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-45709","generatedAt":"2026-10-27T17:45:26.516Z","title":"An issue was discovered in the crypto2 crate through 2021-10-08 for Rust.","description":"An issue was discovered in the crypto2 crate through 2021-10-08 for Rust. During Chacha20 encryption and decryption, an unaligned read of a u32 may occur.","published":"2021-12-27T00:15:10.000Z","lastModified":"2026-06-17T04:14:00.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","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"},"cwe":["CWE-119"],"affected":["crypto2 project/crypto2"],"epss":{"score":0.00778,"percentile":0.55602,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.78%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/crypto2/RUSTSEC-2021-0121.md","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://rustsec.org/advisories/RUSTSEC-2021-0121.html","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/crypto2/RUSTSEC-2021-0121.md","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://rustsec.org/advisories/RUSTSEC-2021-0121.html","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-45709","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}