UBUNTU-CVE-2023-42117

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    UBUNTU-CVE-2023-42117

    Published: 28 Sept 2023Last Modified: 10 Jun 2026
    Upstream:
    CVE-2023-42117

    Summary:

    Details: Exim Improper Neutralization of Special Elements Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Exim. Authentication is not required to exploit this vulnerability. The specific flaw exists within the smtp service, which listens on TCP port 25 by default. The issue results from the lack of proper validation of user-supplied data, which can result in a memory corruption condition. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-17554.

    References: https://ubuntu.com/security/CVE-2023-42117, https://www.zerodayinitiative.com/advisories/ZDI-23-1471/, https://exim.org/static/doc/security/CVE-2023-zdi.txt, https://ubuntu.com/security/notices/USN-6455-1, https://ubuntu.com/security/notices/USN-6455-2, https://www.cve.org/CVERecord?id=CVE-2023-42117

    Affected packages

    Package

    Name: exim4

    Purl: pkg:deb/ubuntu/exim4?arch=source&distro=trusty%2Fesm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -4.82-3ubuntu2.4+esm7

    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-2023-42117 | CVE-DB