CVE-2021-31406

    Dashboard / Vulnerabilities / CVE-2021-31406

    CVE-2021-31406

    Published: 23 Apr 2021Last Modified: 7 Aug 2026

    Summary:

    Details: Non-constant-time comparison of CSRF tokens in endpoint request handler in com.vaadin:flow-server versions 3.0.0 through 5.0.3 (Vaadin 15.0.0 through 18.0.6), and com.vaadin:fusion-endpoint version 6.0.0 (Vaadin 19.0.0) allows attacker to guess a security token for Fusion endpoints via timing attack.

    References: https://vaadin.com/security/cve-2021-31406, https://github.com/vaadin/flow/pull/10157

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 4b6ca4330163c4e976b32d03880fe2154a9d1ca7
    Fixed -b9cc454b011a504d841b53d192cf21f45a0bf829

    Affected versions

    6.0.0-NA
    6.0.0.rc1
    6.0.0

    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-2021-31406 | CVE-DB