UBUNTU-CVE-2020-28896

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    UBUNTU-CVE-2020-28896

    Published: 23 Nov 2020Last Modified: 4 Feb 2026
    Upstream:
    CVE-2020-28896

    Summary:

    Details: Mutt before 2.0.2 and NeoMutt before 2020-11-20 did not ensure that $ssl_force_tls was processed if an IMAP server's initial server response was invalid. The connection was not properly closed, and the code could continue attempting to authenticate. This could result in authentication credentials being exposed on an unencrypted connection, or to a machine-in-the-middle.

    References: https://ubuntu.com/security/CVE-2020-28896, https://github.com/neomutt/neomutt/releases/tag/20201120, https://gitlab.com/muttmua/mutt/-/commit/d92689088dfe80a290ec836e292376e2d9984f8f, https://ubuntu.com/security/notices/USN-4645-1, https://www.cve.org/CVERecord?id=CVE-2020-28896, https://ubuntu.com/security/notices/USN-7204-1

    Affected packages

    Package

    Name: mutt

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

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.5.24-1ubuntu0.5

    Affected versions

    1.5.23-3.1ubuntu1
    1.5.23-3.1ubuntu2
    1.5.24-1
    1.5.24-1build1
    1.5.24-1ubuntu0.1
    1.5.24-1ubuntu0.2
    1.5.24-1ubuntu0.3
    1.5.24-1ubuntu0.4

    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-2020-28896 | CVE-DB