Home/CVE/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 ha
CVE

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 ha

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.

MEDIUM · CVSS 5.9 EPSS 0.00414
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
▤

Affected Products & Versions

5
bouncycastle bc-csharp< 1.8.7
bouncycastle bouncy castle fips .net api< 1.0.1.1
bouncycastle fips java api< 1.0.1.2
bouncycastle fips java api>= 1.0.2 and < 1.0.2.1
bouncycastle the bouncy castle crypto package for java< 1.66
▤

Affected Packages

9
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Maven org.bouncycastle:bc-fips MODERATE fixed in 1.0.2.1
Maven org.bouncycastle:bcprov-ext-jdk15on MODERATE fixed in 1.66
Maven org.bouncycastle:bcprov-ext-jdk16 MODERATE fixed in 1.66
Maven org.bouncycastle:bcprov-jdk14 MODERATE fixed in 1.66
Maven org.bouncycastle:bcprov-jdk15 MODERATE fixed in 1.66
Maven org.bouncycastle:bcprov-jdk15on MODERATE fixed in 1.66
Maven org.bouncycastle:bcprov-jdk15to18 MODERATE fixed in 1.66
Maven org.bouncycastle:bcprov-jdk16 MODERATE fixed in 1.66
NuGet BouncyCastle MODERATE fixed in 1.8.7
▣

Scoring & Timeline

5.9
MEDIUM · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD20 May 2021 · 12:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
⚑

Vendor Advisories

10
suse-csafopenSUSE-SU-2024:10661-1
suse-csafopenSUSE-SU-2024:12868-1
rhsaRHSA-2022:1029Important
rhsaRHSA-2022:1013Moderate
rhsaRHSA-2021:5134Critical
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/bcgit/bc-csharp/wiki/CVE-2020-15522Third Party Advisory
https://github.com/bcgit/bc-java/wiki/CVE-2020-15522Third Party Advisory
https://security.netapp.com/advisory/ntap-20210622-0007/
https://www.bouncycastle.org/releasenotes.htmlRelease NotesVendor Advisory
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