CVE-2021-22881

    Dashboard / Vulnerabilities / CVE-2021-22881

    CVE-2021-22881

    Published: 11 Feb 2021Last Modified: 9 Sept 2026

    Summary:

    Details: The Host Authorization middleware in Action Pack before 6.1.2.1, 6.0.3.5 suffers from an open redirect vulnerability. Specially crafted `Host` headers in combination with certain "allowed host" formats can cause the Host Authorization middleware in Action Pack to redirect users to a malicious website. Impacted applications will have allowed hosts with a leading dot. When an allowed host contains a leading dot, a specially crafted `Host` header can be used to redirect to a malicious website.

    References: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XQ3NS4IBYE2I3MVMGAHFZBZBIZGHXHT3/, http://www.openwall.com/lists/oss-security/2021/05/05/2, http://www.openwall.com/lists/oss-security/2021/08/20/1, http://www.openwall.com/lists/oss-security/2021/12/14/5, https://benjamin-bouchet.com/cve-2021-22881-faille-de-securite-dans-le-middleware-hostauthorization/, https://discuss.rubyonrails.org/t/cve-2021-22881-possible-open-redirect-in-host-authorization-middleware/77130, https://hackerone.com/reports/1047447

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 66cabeda2c46c582d19738e1318be8d59584cc5b
    Fixed -c5929d5eb55b749bc124b3ccc2d79323d015701f

    Affected versions

    v6.1.2
    v6.1.1
    v6.1.0

    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-2021-22881 | CVE-DB