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TI-2021-19458 Aliases CVE-2021-43569GHSA-j3jw-j2j8-2wv9

The verify function in the Stark Bank .NET ECDSA library (ecdsa-dotnet) 1.3.1 fails to…

Priority MEDIUM 44CWE-347Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-347.

Summary

The verify function in the Stark Bank .NET ECDSA library (ecdsa-dotnet) 1.3.1 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages.

Why it matters now

EPSS 0.01056 64th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed starkbank-ecdsa (NuGet): 1.3.2

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
—starkbank-ecdsa (NuGet)before 1.3.21.3.2Patch availableGHSA-j3jw-j2j8-2wv9
  • — Vendor— Affected all versions Fixed in — No fix listed CNA
  • starkbank-ecdsa (NuGet) Vendor— Affected before 1.3.2 Fixed in 1.3.2 Patch available GHSA-j3jw-j2j8-2wv9

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:starkbank:ecdsa-dotnet:1.3.2:*:*:*:*:*:*:*1.3.2VulnerableStarkbank
  • cpe:2.3:a:starkbank:ecdsa-dotnet:1.3.2:*:*:*:*:*:*:* Versions 1.3.2 Vulnerable ·Starkbank

Remediation

  • Fix · GHSA-j3jw-j2j8-2wv9 starkbank-ecdsa (NuGet) Fixed in 1.3.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-43569
  2. 2026-10-03 Alias added: GHSA-j3jw-j2j8-2wv9

References

Exploit 1

Advisory 2

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences