CVE-2021-43569

PoC —

CVSS 3.1

9.8 critical

EPSS

1%p63

Published

Nov 9, 2021 (Nov 9, 2021)

Modified

Jun 17, 2026

Description

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.

Vendors: starkbank
Products: ecdsa-dotnet
Weakness: CWE-347
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (1.1%)

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