CVE-2023-42116

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2023-42116
Exim SMTP Challenge Stack-based Buffer Overflow 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 handling of NTLM challenge requests. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the service account. . Was ZDI-CAN-17515.

9.8 /10

CVSS v3 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://www.zerodayinitiative.com/advisories/ZDI-23-1470/ Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-23-1470/ Third Party Advisory
Configurations

Configuration 1 (hide)

cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*
History

07 Aug 2025, 18:05

Type Values Removed Values Added
CPE cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*
References () https://www.zerodayinitiative.com/advisories/ZDI-23-1470/ - () https://www.zerodayinitiative.com/advisories/ZDI-23-1470/ - Third Party Advisory
CVSS v2 : unknown
v3 : 8.1 		v2 : unknown
v3 : 9.8
First Time Exim
Exim exim

21 Nov 2024, 08:22

Type Values Removed Values Added
References () https://www.zerodayinitiative.com/advisories/ZDI-23-1470/ - () https://www.zerodayinitiative.com/advisories/ZDI-23-1470/ -

18 Sep 2024, 19:15

Type Values Removed Values Added
Summary
  • (es) Vulnerabilidad de ejecución remota de código de desbordamiento de búfer en la región stack de la memoria del desafío SMTP de Exim. Esta vulnerabilidad permite a atacantes remotos ejecutar código arbitrario en las instalaciones afectadas de Exim. No se requiere autenticación para aprovechar esta vulnerabilidad. La falla específica existe en el manejo de solicitudes de desafío NTLM. El problema se debe a la falta de una validación adecuada de la longitud de los datos proporcionados por el usuario antes de copiarlos en un búfer basado en pila de longitud fija. Un atacante puede aprovechar esta vulnerabilidad para ejecutar código en el contexto de la cuenta de servicio. Era ZDI-CAN-17515.
Summary (en) Exim SMTP Challenge Stack-based Buffer Overflow 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 handling of NTLM challenge requests. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the service account. Was ZDI-CAN-17515. (en) Exim SMTP Challenge Stack-based Buffer Overflow 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 handling of NTLM challenge requests. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the service account. . Was ZDI-CAN-17515.

03 May 2024, 03:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-05-03 03:15

Updated : 2025-08-07 18:05

NVD link : CVE-2023-42116

Mitre link : CVE-2023-42116

CVE.ORG link : CVE-2023-42116

JSON object : View

Products Affected

exim

  • exim
CWE
CWE-121

Stack-based Buffer Overflow