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.

• CWE-191

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

Published

May 3, 2024

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2023-42112PDF-XChange Editor EMF File Parsing Out-Of-Bounds Read Infor…5.5
• CVE-2023-42113PDF-XChange Editor EMF File Parsing Out-Of-Bounds Read Infor…5.5
• CVE-2023-42114Exim NTLM Challenge Out-Of-Bounds Read Information Disclosur…5.3
• CVE-2023-42115Exim AUTH Out-Of-Bounds Write Remote Code Execution Vulnerab…9.8
• CVE-2023-42116Exim SMTP Challenge Stack-based Buffer Overflow Remote Code …9.8
• CVE-2023-42117Exim Improper Neutralization of Special Elements Remote Code…9.8
• CVE-2023-42119Exim dnsdb Out-Of-Bounds Read Information Disclosure Vulnera…3.1
• CVE-2023-4212 ​A command injection vulnerability exists in Trane XL824, X…6.8
• CVE-2023-42120Control Web Panel dns_zone_editor Command Injection Remote C…8.8
• CVE-2023-42121Control Web Panel Missing Authentication Remote Code Executi…9.8
• CVE-2023-42122Control Web Panel wloggui Command Injection Local Privilege …7.8
• CVE-2023-42123Control Web Panel mysql_manager Command Injection Remote Cod…8.8