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    CVE-2023-42115

    Exim AUTH Out-Of-Bounds Write 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 write past the end of a buffer. An attacker can leverage this vulnerability to execute code in the context of the service account. . Was ZDI-CAN-17434.

    Published:Sep 27, 2023
    Last Modified:Aug 7, 2025
    EPS:May 3, 2024
    EPSS Score:0.70957
    CVSS Score:9.8

    Affected Products

    Vendor
    Exim
    Product
    Exim

    Exploits

    https://github.com/doaso/CVE-2023-42115https://github.com/kirinse/cve-2023-42115

    Common Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-48840 (CVSS 5.3) — Exim 4.88 before 4.99.4, in some proxy configurations, mishandles certain short payloads, leading to disclosur…
    CVE-2026-45185 (CVSS 9.8) — Exim before 4.99.3, in certain GnuTLS configurations, has a remotely reachable use-after-free in the BDAT body…
    CVE-2026-40686 (CVSS 3.7) — In Exim before 4.99.2, when utf8 operators are enabled, there is an out-of-bounds read if large UTF-8 trailing…
    CVE-2026-40684 (CVSS 5.9) — In Exim before 4.99.2, on systems using musl libc (not glibc), an attacker can crash the connection instance w…
    CVE-2026-40687 (CVSS 4.8) — In Exim before 4.99.2, when the SPA authentication driver is used with an adversarial SPA resource, there can …
    CVE-2026-40685 (CVSS 6.5) — In Exim before 4.99.2, when JSON lookup is enabled, an out-of-bounds heap write can occur when a JSON operator…
    CVE-2025-67896 (CVSS 7) — Exim before 4.99.1, with certain non-default rate-limit configurations, allows a remote heap-based buffer over…
    CVE-2025-53881 (CVSS 6.9) — A UNIX Symbolic Link (Symlink) Following vulnerability in logrotate config in the exim package allowed privile…

    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