UBUNTU-CVE-2020-28024

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    UBUNTU-CVE-2020-28024

    Published: 4 May 2021Last Modified: 22 Apr 2026
    Upstream:
    CVE-2020-28024

    Summary:

    Details: Exim 4 before 4.94.2 allows Buffer Underwrite that may result in unauthenticated remote attackers executing arbitrary commands, because smtp_ungetc was only intended to push back characters, but can actually push back non-character error codes such as EOF.

    References: https://ubuntu.com/security/CVE-2020-28024, https://ubuntu.com/security/notices/USN-4934-1, https://ubuntu.com/security/notices/USN-4934-2, https://www.cve.org/CVERecord?id=CVE-2020-28024

    Affected packages

    Package

    Name: exim4

    Purl: pkg:deb/ubuntu/[email protected]+esm3?arch=source&distro=trusty/esm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -4.82-3ubuntu2.4+esm3

    Affected versions

    4.80-7ubuntu3

    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-2020-28024 | CVE-DB