CVE-2023-42118

HIGH

8.8

Description

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.

CVE Details

CVSS v3.1 Score8.8

SeverityHIGH

CVSS VectorCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack VectorADJACENT_NETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published5/3/2024

Last Modified8/7/2025

Sourcenvd

Honeypot Sightings0

Affected Products

exim:eximlibspf2_project:libspf2

Weaknesses (CWE)

CWE-191

References

https://www.zerodayinitiative.com/advisories/ZDI-23-1472/(zdi-disclosures@trendmicro.com)

http://www.openwall.com/lists/oss-security/2025/03/28/1(af854a3a-2127-422b-91ae-364da2661108)

https://www.zerodayinitiative.com/advisories/ZDI-23-1472/(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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