CVE-2025-67896

Published: Dec 14, 2025Modified: Dec 22, 2025

9.8

Vector

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

Exploitability: 3.9 / Impact: 5.9

Source: NVD

Description

Exim before 4.99.1, with certain non-default rate-limit configurations, allows a remote heap-based buffer overflow because database records are cast directly to internal structures without validation.

Affected (1)

Products: Exim: Exim

Exim

1 product

Exim

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Exim Exim	Before 4.99.1

Related CWEs

CWE-122

Heap-based Buffer Overflow

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

References (5)

https://exim.org/static/doc/security/

Source: cve@mitre.org

Vendor Advisory

https://exim.org/static/doc/security/EXIM-Security-2025-12-09.1/report.txt

Source: cve@mitre.org

Vendor Advisory

https://www.openwall.com/lists/oss-security/2025/12/11/2

Source: cve@mitre.org

Mailing List

http://www.openwall.com/lists/oss-security/2025/12/14/1

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

http://www.openwall.com/lists/oss-security/2025/12/18/3

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List

Timeline

No history available yet.