UBUNTU-CVE-2021-22881

    Dashboard / Vulnerabilities / UBUNTU-CVE-2021-22881

    UBUNTU-CVE-2021-22881

    Published: 11 Feb 2021Last Modified: 20 May 2026
    Upstream:
    CVE-2021-22881

    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://ubuntu.com/security/CVE-2021-22881, https://discuss.rubyonrails.org/t/cve-2021-22881-possible-open-redirect-in-host-authorization-middleware/77130, https://hackerone.com/reports/1047447, https://www.cve.org/CVERecord?id=CVE-2021-22881

    Affected packages

    Package

    Name: rails

    Purl: pkg:deb/ubuntu/rails?arch=source&distro=esm-apps%2Fxenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    2:4.1.10-1

    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
    UBUNTU-CVE-2021-22881 | CVE-DB