{"cve":"CVE-2020-15522","nvd":{"published":"2021-05-20T12:15:08.003","modified":"2026-06-17T02:56:46.943","status":"Modified","description":"Bouncy Castle BC Java before 1.66, BC C# .NET before 1.8.7, BC-FJA before 1.0.1.2, 1.0.2.1, and BC-FNA before 1.0.1.1 have a timing issue within the EC math library that can expose information about the private key when an attacker is able to observe timing information for the generation of multiple deterministic ECDSA signatures.","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-362"],"references":["https://github.com/bcgit/bc-csharp/wiki/CVE-2020-15522","https://github.com/bcgit/bc-java/wiki/CVE-2020-15522","https://security.netapp.com/advisory/ntap-20210622-0007/","https://www.bouncycastle.org/releasenotes.html","https://github.com/bcgit/bc-csharp/wiki/CVE-2020-15522"],"products":["bouncycastle:bc-csharp","bouncycastle:bouncy_castle_fips_.net_api","bouncycastle:fips_java_api","bouncycastle:the_bouncy_castle_crypto_package_for_java"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2020-15522","score":0.01522,"percentile":0.74629,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-6xx3-rg99-gc3p","url":"https://osv.dev/vulnerability/GHSA-6xx3-rg99-gc3p","summary":"Timing based private key exposure in Bouncy Castle","modified":"2026-09-10T03:49:07.703437625Z","packages":[{"ecosystem":"Maven","name":"org.bouncycastle:bc-fips","purl":"pkg:maven/org.bouncycastle/bc-fips","ranges":["<1.0.2.1"],"fixed":["1.0.2.1"]},{"ecosystem":"Maven","name":"org.bouncycastle:bcprov-ext-jdk15on","purl":"pkg:maven/org.bouncycastle/bcprov-ext-jdk15on","ranges":["<1.66"],"fixed":["1.66"]},{"ecosystem":"Maven","name":"org.bouncycastle:bcprov-ext-jdk16","purl":"pkg:maven/org.bouncycastle/bcprov-ext-jdk16","ranges":["<1.66"],"fixed":["1.66"]},{"ecosystem":"Maven","name":"org.bouncycastle:bcprov-jdk14","purl":"pkg:maven/org.bouncycastle/bcprov-jdk14","ranges":["<1.66"],"fixed":["1.66"]},{"ecosystem":"Maven","name":"org.bouncycastle:bcprov-jdk15","purl":"pkg:maven/org.bouncycastle/bcprov-jdk15","ranges":["<1.66"],"fixed":["1.66"]},{"ecosystem":"Maven","name":"org.bouncycastle:bcprov-jdk15on","purl":"pkg:maven/org.bouncycastle/bcprov-jdk15on","ranges":["<1.66"],"fixed":["1.66"]},{"ecosystem":"Maven","name":"org.bouncycastle:bcprov-jdk15to18","purl":"pkg:maven/org.bouncycastle/bcprov-jdk15to18","ranges":["<1.66"],"fixed":["1.66"]},{"ecosystem":"Maven","name":"org.bouncycastle:bcprov-jdk16","purl":"pkg:maven/org.bouncycastle/bcprov-jdk16","ranges":["<1.66"],"fixed":["1.66"]},{"ecosystem":"NuGet","name":"BouncyCastle","purl":"pkg:nuget/BouncyCastle","ranges":["<1.8.7"],"fixed":["1.8.7"]}]}],"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."]}