HOMEVULNERABILITIESCVE-2020-15522
MEDIUM

CVE-2020-15522

CWE-362Published: May 20, 2021· Updated: Jun 17, 2026

5.9
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2020-15522 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 5.9.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

bouncycastle4 product(s)
bc-csharpbouncy castle fips .net apifips java apithe bouncy castle crypto package for java
Source: NVD CPE · 4 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://github.com/bcgit/bc-csharp/wiki/CVE-2020-15522
ADVISORYhttps://github.com/bcgit/bc-java/wiki/CVE-2020-15522
ADVISORYhttps://www.bouncycastle.org/releasenotes.html
ADVISORYhttps://github.com/bcgit/bc-csharp/wiki/CVE-2020-15522
ADVISORYhttps://github.com/bcgit/bc-java/wiki/CVE-2020-15522
ADVISORYhttps://www.bouncycastle.org/releasenotes.html

All References (8)

→
https://github.com/bcgit/bc-csharp/wiki/CVE-2020-15522Third Party Advisory
→
https://github.com/bcgit/bc-java/wiki/CVE-2020-15522Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20210622-0007/
→
https://www.bouncycastle.org/releasenotes.htmlRelease Notes · Vendor Advisory
→
https://github.com/bcgit/bc-csharp/wiki/CVE-2020-15522Third Party Advisory
→
https://github.com/bcgit/bc-java/wiki/CVE-2020-15522Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20210622-0007/
→
https://www.bouncycastle.org/releasenotes.htmlRelease Notes · Vendor Advisory

Quick Facts

CVE IDCVE-2020-15522
CVSS Score5.9 / 10
SeverityMEDIUM
WeaknessCWE-362
CISA KEVNo
Affected1 vendor(s)
PublishedMay 20, 2021

Related CVEs (CWE-362)

CVE-2010-1228
10.0
CVE-2014-0703
10.0
CVE-2008-6598
10.0
CVE-2015-8556
10.0
CVE-2020-1660
9.9
CVE-2026-56188
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-15522 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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