5.9

CVE-2020-15522: bouncycastle bc-csharp Race Condition

CVSS: 5.9v3.1MediumModified
AliasesSUSE-SU-2021:2163-1UBUNTU-CVE-2020-15522DEBIAN-CVE-2020-15522
Published 20-05-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-15522 is a medium (CVSS 5.9) Race Condition vulnerability in bouncycastle bc-csharp. EPSS estimates a 1.52% chance of exploitation in the next 30 days, higher than 74.2% of scored vulnerabilities.

Overall risk
24/100
0100
Low · default modelHow is this calculated?
CVSS score
5.9/10
010
Medium · v3.1 (NVD)
EPSS score
1.52%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 4
OPENSUSE-SU-2024:10661-1CGA-238P-9X72-8G44CGA-3544-C7XC-JX43CGA-P736-F9R6-77R7

Timeline

  1. 20-05-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

7 scores · 6 sources · 2 versions

EPSS trend

Probability

1.52%

Chance of exploitation in the next 30 days

Percentile

74%

Versus all other CVEs

30-day change

0.00 pp

From 1.52% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.52%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard93 products
  • eco-java-gradle-1.11All versions (No fix recorded)
  • eco-java-gradle-2.0All versions (No fix recorded)
  • eco-java-gradle-2.1All versions (No fix recorded)
  • eco-java-gradle-2.10All versions (No fix recorded)
  • eco-java-gradle-2.11All versions (No fix recorded)
Org.bouncycastle8 products
  • bc-fips< 1.0.2.1
  • bcprov-ext-jdk15on< 1.66
  • bcprov-ext-jdk16< 1.66
  • bcprov-jdk14< 1.66
  • bcprov-jdk15< 1.66
Bouncycastle4 products
Opensuse2 products
  • bouncycastle&distro=openSUSE Leap 15.2< 1.64-lp152.2.3.1
  • bouncycastle&distro=openSUSE Leap 15.3< 1.64-3.3.1
Suse2 products
  • bouncycastle&distro=SUSE Linux Enterprise Module for Development Tools 15 SP2< 1.64-3.3.1
  • bouncycastle&distro=SUSE Linux Enterprise Module for Development Tools 15 SP3< 1.64-3.3.1
Debian1 product
  • bouncycastle< 1.68-1
NuGet1 product
  • BouncyCastle< 1.8.7
Ubuntu1 product
  • bouncycastleAll versions (No fix recorded)

8 vendors · 112 products

References

14 links
Show all 14 references