CVE-2023-42118

high · 8.8

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

CVSS

51.8%

EPSS (exploit prob.)

99th

EPSS percentile

2024-05-03

Published

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

Weaknesses

CWE-191

Affected products

Vendor	Product	Affected versions
libspf2_project	libspf2	all versions
exim	exim	all versions

Check a specific version with /api/v1/cve/match.

References

https://www.zerodayinitiative.com/advisories/ZDI-23-1472/
http://www.openwall.com/lists/oss-security/2025/03/28/1
https://www.zerodayinitiative.com/advisories/ZDI-23-1472/

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2023-42118