{"cve":"CVE-2019-25005","nvd":{"published":"2020-12-31T10:15:14.410","modified":"2026-06-17T02:31:27.940","status":"Modified","description":"An issue was discovered in the chacha20 crate before 0.2.3 for Rust. A ChaCha20 counter overflow makes it easier for attackers to determine plaintext.","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:N/A:N","score":7.5},"cwes":["CWE-190"],"references":["https://rustsec.org/advisories/RUSTSEC-2019-0029.html","https://rustsec.org/advisories/RUSTSEC-2019-0029.html"],"products":["chacha20_project:chacha20"],"source":"nvd","synced_at":"2026-10-19T21:12:09.559580076+00:00"},"epss":{"cve":"CVE-2019-25005","score":0.01325,"percentile":0.70947,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-j2r6-2m5c-vgh5","url":"https://osv.dev/vulnerability/GHSA-j2r6-2m5c-vgh5","summary":"Counter overflow in chacha20","modified":"2023-11-08T04:01:32.169231Z","packages":[{"ecosystem":"crates.io","name":"chacha20","purl":"pkg:cargo/chacha20","ranges":["<0.2.3"],"fixed":["0.2.3"]}]},{"id":"RUSTSEC-2019-0029","url":"https://osv.dev/vulnerability/RUSTSEC-2019-0029","summary":"ChaCha20 counter overflow can expose repetitions in the keystream","modified":"2023-11-08T04:01:32.169231Z","packages":[{"ecosystem":"crates.io","name":"chacha20","purl":"pkg:cargo/chacha20","ranges":[">=0.0.0-0 <0.2.3"],"fixed":["0.2.3"]}]}],"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."]}