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Vulnerability details: VCID-2u8v-56gn-8uc2
Vulnerability ID VCID-2u8v-56gn-8uc2
Aliases CVE-2020-15522
GHSA-6xx3-rg99-gc3p
Summary Timing based private key exposure in Bouncy Castle Bouncy Castle BC Java before 1.66, BC C# .NET before 1.8.7, BC-FJA before 1.0.2.1, BC before 1.66, 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.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (5)
CWE-203 Observable Discrepancy
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
System Score Found at
cvssv3 5.9 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-15522.json
epss 0.00403 https://api.first.org/data/v1/epss?cve=CVE-2020-15522
epss 0.00403 https://api.first.org/data/v1/epss?cve=CVE-2020-15522
epss 0.00403 https://api.first.org/data/v1/epss?cve=CVE-2020-15522
epss 0.0057 https://api.first.org/data/v1/epss?cve=CVE-2020-15522
epss 0.0057 https://api.first.org/data/v1/epss?cve=CVE-2020-15522
epss 0.0057 https://api.first.org/data/v1/epss?cve=CVE-2020-15522
epss 0.0057 https://api.first.org/data/v1/epss?cve=CVE-2020-15522
epss 0.0057 https://api.first.org/data/v1/epss?cve=CVE-2020-15522
epss 0.0057 https://api.first.org/data/v1/epss?cve=CVE-2020-15522
epss 0.0057 https://api.first.org/data/v1/epss?cve=CVE-2020-15522
epss 0.0057 https://api.first.org/data/v1/epss?cve=CVE-2020-15522
epss 0.0057 https://api.first.org/data/v1/epss?cve=CVE-2020-15522
epss 0.0057 https://api.first.org/data/v1/epss?cve=CVE-2020-15522
epss 0.0057 https://api.first.org/data/v1/epss?cve=CVE-2020-15522
epss 0.0057 https://api.first.org/data/v1/epss?cve=CVE-2020-15522
cvssv3.1 5.9 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-6xx3-rg99-gc3p
cvssv3.1 5.1 https://github.com/bcgit/bc-csharp/wiki/CVE-2020-15522
generic_textual MODERATE https://github.com/bcgit/bc-csharp/wiki/CVE-2020-15522
cvssv3.1 5.1 https://github.com/bcgit/bc-java/wiki/CVE-2020-15522
generic_textual MODERATE https://github.com/bcgit/bc-java/wiki/CVE-2020-15522
cvssv3.1 5.1 https://nvd.nist.gov/vuln/detail/CVE-2020-15522
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2020-15522
cvssv3.1 5.1 https://security.netapp.com/advisory/ntap-20210622-0007
generic_textual MODERATE https://security.netapp.com/advisory/ntap-20210622-0007
cvssv3.1 5.1 https://www.bouncycastle.org/releasenotes.html
generic_textual MODERATE https://www.bouncycastle.org/releasenotes.html
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-15522.json
https://api.first.org/data/v1/epss?cve=CVE-2020-15522
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15522
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://security.netapp.com/advisory/ntap-20210622-0007
https://www.bouncycastle.org/releasenotes.html
1962879 https://bugzilla.redhat.com/show_bug.cgi?id=1962879
CVE-2020-15522 https://github.com/bcgit/bc-csharp/wiki/CVE-2020-15522
CVE-2020-15522 https://github.com/bcgit/bc-java/wiki/CVE-2020-15522
CVE-2020-15522 https://nvd.nist.gov/vuln/detail/CVE-2020-15522
GHSA-6xx3-rg99-gc3p https://github.com/advisories/GHSA-6xx3-rg99-gc3p
RHSA-2021:1401 https://access.redhat.com/errata/RHSA-2021:1401
RHSA-2021:2755 https://access.redhat.com/errata/RHSA-2021:2755
RHSA-2021:5134 https://access.redhat.com/errata/RHSA-2021:5134
RHSA-2022:1013 https://access.redhat.com/errata/RHSA-2022:1013
RHSA-2022:1029 https://access.redhat.com/errata/RHSA-2022:1029
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-15522.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/bcgit/bc-csharp/wiki/CVE-2020-15522
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/bcgit/bc-java/wiki/CVE-2020-15522
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-15522
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://security.netapp.com/advisory/ntap-20210622-0007
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://www.bouncycastle.org/releasenotes.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.60922
EPSS Score 0.00403
Published At April 24, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:48:39.614952+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/maven/org.bouncycastle/bcprov-jdk16/CVE-2020-15522.yml 38.0.0