Paper/Archive/CVE-2025-67896

CVE-2025-67896

Exim Exim — Exim before 4.99.1, with certain non-default rate-limit configurations, allows a remote heap-based buffer overflow because database recor…

EPSS 0.5%CVSS 9.8

critical.is priorityof 100

CVSS 9.8 (NVD)9.8 / 10 × 3029.4 Not in CISA KEV+300.0 EPSS percentile 40.6.406 × 208.1 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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

ProductAffectedFixed inSource

Exim4.99 – < 4.99.14.99.1CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

mitre (CNA)7.0CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L

CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refopenwall.com/lists/oss-security/2025/12/11/2 refexim.org/static/doc/security refexim.org/static/doc/security/EXIM-Security-2025-12-09.1/report.txt refopenwall.com/lists/oss-security/2025/12/14/1 refopenwall.com/lists/oss-security/2025/12/18/3