CVE-2020-15522: Timing based private key exposure in Bouncy Castle

August 13, 2021 (updated July 17, 2025)

Bouncy Castle BC Java before 1.66, BC C# .NET before 1.8.7, BC-FJA before 1.0.2.1, BC before 1.66, 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.

References

github.com/advisories/GHSA-6xx3-rg99-gc3p
github.com/bcgit/bc-csharp/wiki/CVE-2020-15522
github.com/bcgit/bc-java/wiki/CVE-2020-15522
nvd.nist.gov/vuln/detail/CVE-2020-15522
security.netapp.com/advisory/ntap-20210622-0007
www.bouncycastle.org/releasenotes.html

Code Behaviors & Features

Detect and mitigate CVE-2020-15522 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →