CVE-2023-42118

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2023-42118
Exim libspf2 Integer Underflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Exim libspf2. Authentication is not required to exploit this vulnerability. The specific flaw exists within the parsing of SPF macros. When parsing SPF macros, the process does not properly validate user-supplied data, which can result in an integer underflow before writing to memory. An attacker can leverage this vulnerability to execute code in the context of the service account. . Was ZDI-CAN-17578.

8.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector ADJACENT_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-23-1472/ Third Party Advisory
http://www.openwall.com/lists/oss-security/2025/03/28/1 Mailing List
https://www.zerodayinitiative.com/advisories/ZDI-23-1472/ Third Party Advisory
Configurations

Configuration 1 (hide)

AND
cpe:2.3:a:libspf2_project:libspf2:-:*:*:*:*:*:*:*
cpe:2.3:a:exim:exim:-:*:*:*:*:*:*:*
History

07 Aug 2025, 18:17

Type Values Removed Values Added
References () https://www.zerodayinitiative.com/advisories/ZDI-23-1472/ - () https://www.zerodayinitiative.com/advisories/ZDI-23-1472/ - Third Party Advisory
References () http://www.openwall.com/lists/oss-security/2025/03/28/1 - () http://www.openwall.com/lists/oss-security/2025/03/28/1 - Mailing List
CPE cpe:2.3:a:libspf2_project:libspf2:-:*:*:*:*:*:*:*
cpe:2.3:a:exim:exim:-:*:*:*:*:*:*:*
First Time Exim
Libspf2 Project libspf2
Exim exim
Libspf2 Project
CVSS v2 : unknown
v3 : 7.5 		v2 : unknown
v3 : 8.8

28 Mar 2025, 12:15

Type Values Removed Values Added
References
  • () http://www.openwall.com/lists/oss-security/2025/03/28/1 -

21 Nov 2024, 08:22

Type Values Removed Values Added
References () https://www.zerodayinitiative.com/advisories/ZDI-23-1472/ - () https://www.zerodayinitiative.com/advisories/ZDI-23-1472/ -

18 Sep 2024, 19:15

Type Values Removed Values Added
Summary
  • (es) Vulnerabilidad de ejecución remota de código de desbordamiento de enteros Exim libspf2. Esta vulnerabilidad permite a atacantes adyacentes a la red ejecutar código arbitrario en instalaciones afectadas de Exim libspf2. No se requiere autenticación para aprovechar esta vulnerabilidad. La falla específica existe en el análisis de las macros SPF. Al analizar macros SPF, el proceso no valida adecuadamente los datos proporcionados por el usuario, lo que puede provocar un desbordamiento insuficiente de enteros antes de escribir en la memoria. Un atacante puede aprovechar esta vulnerabilidad para ejecutar código en el contexto de la cuenta de servicio. Era ZDI-CAN-17578.
Summary (en) Exim libspf2 Integer Underflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Exim libspf2. Authentication is not required to exploit this vulnerability. The specific flaw exists within the parsing of SPF macros. When parsing SPF macros, the process does not properly validate user-supplied data, which can result in an integer underflow before writing to memory. An attacker can leverage this vulnerability to execute code in the context of the service account. Was ZDI-CAN-17578. (en) Exim libspf2 Integer Underflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Exim libspf2. Authentication is not required to exploit this vulnerability. The specific flaw exists within the parsing of SPF macros. When parsing SPF macros, the process does not properly validate user-supplied data, which can result in an integer underflow before writing to memory. An attacker can leverage this vulnerability to execute code in the context of the service account. . Was ZDI-CAN-17578.

03 May 2024, 03:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-05-03 03:15

Updated : 2025-08-07 18:17

NVD link : CVE-2023-42118

Mitre link : CVE-2023-42118

CVE.ORG link : CVE-2023-42118

JSON object : View

Products Affected

libspf2_project

  • libspf2

exim

  • exim
CWE
CWE-191

Integer Underflow (Wrap or Wraparound)