CVE-2021-31404

    Dashboard / Vulnerabilities / CVE-2021-31404

    CVE-2021-31404

    Published: 23 Apr 2021Last Modified: 7 Aug 2026

    Summary:

    Details: Non-constant-time comparison of CSRF tokens in UIDL request handler in com.vaadin:flow-server versions 1.0.0 through 1.0.13 (Vaadin 10.0.0 through 10.0.16), 1.1.0 prior to 2.0.0 (Vaadin 11 prior to 14), 2.0.0 through 2.4.6 (Vaadin 14.0.0 through 14.4.6), 3.0.0 prior to 5.0.0 (Vaadin 15 prior to 18), and 5.0.0 through 5.0.2 (Vaadin 18.0.0 through 18.0.5) allows attacker to guess a security token via timing attack.

    References: https://vaadin.com/security/cve-2021-31404, https://github.com/vaadin/flow/pull/9875

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 3cd0c02025aba6de6fd78a8ea65c67483a721b4e
    Fixed -3a0bec8198b110458ccea3d5165de9d402817426

    Affected versions

    2.4.6
    2.4.5
    2.4.4
    2.4.3
    2.4.2
    2.4.1
    2.4.0
    2.4.0.beta2
    2.4.0.beta1
    2.4.0.alpha1

    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-2021-31404 | CVE-DB