vulnerability
Exim: CVE-2025-67896: Heap-based Buffer Overflow
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 8 | (AV:N/AC:M/Au:N/C:P/I:C/A:P) | Dec 14, 2025 | Apr 7, 2026 | Jun 9, 2026 |
Severity
8
CVSS
(AV:N/AC:M/Au:N/C:P/I:C/A:P)
Published
Dec 14, 2025
Added
Apr 7, 2026
Modified
Jun 9, 2026
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.
Solution
exim-upgrade-latest
References
- CVE-2025-67896
- https://attackerkb.com/topics/CVE-2025-67896
- http://www.openwall.com/lists/oss-security/2025/12/14/1
- http://www.openwall.com/lists/oss-security/2025/12/18/3
- https://exim.org/static/doc/security/
- https://exim.org/static/doc/security/EXIM-Security-2025-12-09.1/report.txt
- https://www.openwall.com/lists/oss-security/2025/12/11/2
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-203281
- CWE-122
- EUVD-EUVD-2025-203281
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