CVE-2020-28024

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    CVE-2020-28024

    Published: 6 May 2021Last Modified: 8 Jul 2026

    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://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28024-UNGET.txt

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -919111edac911ba9c15422eafd7c5bf14d416d26

    Affected versions

    exim-4.94.1
    exim-4.94

    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-2020-28024 | CVE-DB