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CVE-2020-15522

MEDIUM
5.9
CVSS Score
Published: May 20, 2021 at 11:20 AM UTC
Updated: June 17, 2026 at 02:56 AM UTC
4 products affected across 1 vendorFips Java APIBc CsharpThe Bouncy Castle Crypto Package for Java

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Severity
MEDIUM5.9
Exploit prediction
EPSS 2%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Bc Csharp· Bouncycastle
95%
v < 1.8.7
Affected range stops below 1.8.7, so it looks safe — our inference, not a vendor statement
Bouncy Castle Fips .net API· Bouncycastle
95%
v < 1.0.1.1
Affected range stops below 1.0.1.1, so it looks safe — our inference, not a vendor statement
Fips Java API· Bouncycastle
95%
v < 1.0.1.21.0.2 ≤ v < 1.0.2.1
Affected range stops below 1.0.1.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.0.2.1, so it looks safe — our inference, not a vendor statement
The Bouncy Castle Crypto Package for Java· Bouncycastle
95%
v < 1.66
Affected range stops below 1.66, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

x_refsource_MISCThird Party Advisory
Source: [email protected]
https://github.com/bcgit/bc-csharp/wiki/CVE-2020-15522
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://github.com/bcgit/bc-java/wiki/CVE-2020-15522
x_refsource_CONFIRM
Source: [email protected]
https://security.netapp.com/advisory/ntap-20210622-0007/
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://www.bouncycastle.org/releasenotes.html

CVSS

5.9MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-362

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