CVE-2021-43569

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    CVE-2021-43569

    Published: 9 Nov 2021Last Modified: 20 Oct 2026

    Summary:

    Details: 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.

    References: https://github.com/starkbank/ecdsa-dotnet/releases/tag/v1.3.2, https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries/

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 76b1faf93152c7b0614a2e90ffb2ef51b30606a2
    Fixed -None

    Affected versions

    1.3.2

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-43569 | CVE-DB