Vulnerability in Bouncycastle Bc-Csharp
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 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.
Vulnerability class: Race Condition
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.015 (74.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.bouncycastle.org/releasenotes.html (Release Notes, Vendor Advisory)
- github.com/bcgit/bc-java/wiki/CVE-2020-15522 (Third Party Advisory)
- github.com/bcgit/bc-csharp/wiki/CVE-2020-15522 (Third Party Advisory)
- security.netapp.com/advisory/ntap-20210622-0007/
Frequently asked questions
- What is CVE-2020-15522?
- CVE-2020-15522 is a medium-severity vulnerability in Bouncycastle Bc-Csharp, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 5.9/10. Published 2021-05-20.
- How severe is CVE-2020-15522?
- Medium severity. CVSS v3 base score is 5.9 out of 10.
- Is CVE-2020-15522 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.