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Vulnerability record · CVE-2025-67896 · published 14 December 2025

CVE-2025-67896: Exim heap-based buffer overflow vulnerability

Exim · Exim

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.

9.8 CVSS 3.1 Critical EPSS 0.47% · top 61.5% CWE-122 · Heap-based buffer overflow
9.8CVSS 3.1 base score
0.47%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
17 Jun 2026Last modified by 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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://exim.org/static/doc/security/ Vendor Advisory
https://exim.org/static/doc/security/EXIM-Security-2025-12-09.1/report.txt Vendor Advisory
https://www.openwall.com/lists/oss-security/2025/12/11/2 Mailing List
http://www.openwall.com/lists/oss-security/2025/12/14/1 Mailing List
http://www.openwall.com/lists/oss-security/2025/12/18/3 Mailing List

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-67896), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.