CVE-2021-43572

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    CVE-2021-43572

    Published: 9 Nov 2021Last Modified: 9 Jul 2026

    Summary:

    Details: The verify function in the Stark Bank Python ECDSA library (aka starkbank-escada or ecdsa-python) before 2.0.1 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages.

    References: https://github.com/starkbank/ecdsa-python/releases/tag/v2.0.1, https://github.com/starkbank/ecdsa-python/commit/d136170666e9510eb63c2572551805807bd4c17f, 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- 0
    Fixed -cb6d807a697d952916a0c46ce05ddd4d78718ca7

    Affected versions

    v2.0.0

    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-2021-43572 | CVE-DB