UBUNTU-CVE-2021-3639

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    UBUNTU-CVE-2021-3639

    Published: 4 Aug 2021Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-3639

    Summary:

    Details: A flaw was found in mod_auth_mellon where it does not sanitize logout URLs properly. This issue could be used by an attacker to facilitate phishing attacks by tricking users into visiting a trusted web application URL that redirects to an external and potentially malicious server. The highest threat from this liability is to confidentiality and integrity.

    References: https://ubuntu.com/security/CVE-2021-3639, https://ubuntu.com/security/notices/USN-5069-1, https://ubuntu.com/security/notices/USN-5069-2, https://www.cve.org/CVERecord?id=CVE-2021-3639

    Affected packages

    Package

    Name: libapache2-mod-auth-mellon

    Purl: pkg:deb/ubuntu/[email protected]+deb9u1build0.16.04.1?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    0.10.0-1

    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-2021-3639 | CVE-DB