{"cve":"CVE-2019-20399","nvd":{"published":"2020-01-23T00:15:09.953","modified":"2026-06-17T02:30:21.990","status":"Modified","description":"A timing vulnerability in the Scalar::check_overflow function in Parity libsecp256k1-rs before 0.3.1 potentially allows an attacker to leak information via a side-channel attack.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","score":5.9},"cwes":["CWE-203"],"references":["https://github.com/paritytech/libsecp256k1/commit/11ba23a9766a5079918cd9f515bc100bc8164b50","https://github.com/paritytech/libsecp256k1/commit/11ba23a9766a5079918cd9f515bc100bc8164b50"],"products":["parity:libsecp256k1"],"source":"nvd","synced_at":"2026-10-19T21:01:01.339895972+00:00"},"epss":{"cve":"CVE-2019-20399","score":0.00881,"percentile":0.59152,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-7cqg-8449-rmfv","url":"https://osv.dev/vulnerability/GHSA-7cqg-8449-rmfv","summary":"Observable Discrepancy in libsecp256k1-rs","modified":"2023-11-08T04:01:30.388161Z","packages":[{"ecosystem":"crates.io","name":"libsecp256k1-rs","purl":"pkg:cargo/libsecp256k1-rs","ranges":["<0.3.1"],"fixed":["0.3.1"]}]},{"id":"RUSTSEC-2020-0156","url":"https://osv.dev/vulnerability/RUSTSEC-2020-0156","summary":"Observable Discrepancy in libsecp256k1-rs","modified":"2023-11-08T04:01:30.388161Z","packages":[{"ecosystem":"crates.io","name":"libsecp256k1-rs","purl":"pkg:cargo/libsecp256k1-rs","ranges":[">=0.0.0-0 <0.3.1"],"fixed":["0.3.1"]}]}],"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."]}