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.
Advisories

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Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 26 Dec 2025 12:15:00 +0000

Type Values Removed Values Added
Title exim: Exim: Remote heap corruption vulnerability
References
Metrics threat_severity

None

threat_severity

Moderate


Thu, 18 Dec 2025 23:30:00 +0000

Type Values Removed Values Added
References

Thu, 18 Dec 2025 17:30:00 +0000

Type Values Removed Values Added
Description Exim before 4.99.1 allows remote heap corruption that will be further described on 2025-12-18. 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.
References
Metrics cvssV3_1

{'score': 6.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L'}

cvssV3_1

{'score': 7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L'}


Mon, 15 Dec 2025 22:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sun, 14 Dec 2025 14:30:00 +0000

Type Values Removed Values Added
References

Sun, 14 Dec 2025 05:15:00 +0000

Type Values Removed Values Added
First Time appeared Exim
Exim exim
CPEs cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*
Vendors & Products Exim
Exim exim

Sun, 14 Dec 2025 04:15:00 +0000

Type Values Removed Values Added
Description Exim before 4.99.1 allows remote heap corruption that will be further described on 2025-12-18.
Weaknesses CWE-122
References
Metrics cvssV3_1

{'score': 6.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2025-12-18T23:04:16.938Z

Reserved: 2025-12-14T04:00:24.063Z

Link: CVE-2025-67896

cve-icon Vulnrichment

Updated: 2025-12-18T23:04:16.938Z

cve-icon NVD

Status : Analyzed

Published: 2025-12-14T04:15:50.287

Modified: 2025-12-22T19:15:45.067

Link: CVE-2025-67896

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-12-14T04:00:24Z

Links: CVE-2025-67896 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses