CVE-2025-67896
criticalExim before 4.99.1, with certain non-default rate-limit configurations, allows a remote heap-based buffer overflow because database records are cast directly t…
Vendor / product: 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.
CVSS
9.8
9.8 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2025-12-14 04:15
Modified: 2026-10-14 13:10
NVD status: Analyzed
Last synced 2 days ago
Verified against the source API 2026-10-27 07:06 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
exim / exim <4.99.1
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://exim.org/static/doc/security/
References
- https://exim.org/static/doc/security/ cve@mitre.org
- https://exim.org/static/doc/security/EXIM-Security-2025-12-09.1/report.txt cve@mitre.org
- https://www.openwall.com/lists/oss-security/2025/12/11/2 cve@mitre.org
- http://www.openwall.com/lists/oss-security/2025/12/14/1 af854a3a-2127-422b-91ae-364da2661108
- http://www.openwall.com/lists/oss-security/2025/12/18/3 af854a3a-2127-422b-91ae-364da2661108
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 07:06 UTC · record ↗