CVE-2020-15522
CVE-2020-15522 is a medium-severity vulnerability in Bouncycastle Bc-csharp with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-362.
Key facts
- Severity: Medium (CVSS 3.x base score 5.9)
- CVSS v2: 4.3
- EPSS exploit prediction: 2% (72nd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-362
- Affected product: Bouncycastle Bc-csharp
- Published:
- Last modified:
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.
Frequently asked questions
- What is 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.
- How severe is CVE-2020-15522?
- CVE-2020-15522 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
- Is CVE-2020-15522 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-15522?
- CVE-2020-15522 primarily affects Bouncycastle Bc-csharp. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2020-15522?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2020-15522 published?
- CVE-2020-15522 was published on 2021-05-20 and last updated on 2026-06-17.
References
- https://github.com/bcgit/bc-csharp/wiki/CVE-2020-15522
- https://github.com/bcgit/bc-java/wiki/CVE-2020-15522
- https://security.netapp.com/advisory/ntap-20210622-0007/
- https://www.bouncycastle.org/releasenotes.html
Affected products (4)
- cpe:2.3:a:bouncycastle:bc-csharp:*:*:*:*:*:*:*:*
- cpe:2.3:a:bouncycastle:bouncy_castle_fips_.net_api:*:*:*:*:*:*:*:*
- cpe:2.3:a:bouncycastle:fips_java_api:*:*:*:*:*:*:*:*
- cpe:2.3:a:bouncycastle:the_bouncy_castle_crypto_package_for_java:*:*:*:*:*:*:*:*
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