{"id":"CVE-2025-67896","title":"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.","summary":"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.","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L","cwe":["CWE-122"],"vendor":"exim","product":"exim","affected":["exim < 4.99.1"],"patched":["exim 4.99.1"],"published":"2025-12-14","updated":"2026-10-14","sourceUpdated":"2026-10-14T13:10:00.187","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-67896","references":[{"url":"https://exim.org/static/doc/security/","label":"cve@mitre.org"},{"url":"https://exim.org/static/doc/security/EXIM-Security-2025-12-09.1/report.txt","label":"cve@mitre.org"},{"url":"https://www.openwall.com/lists/oss-security/2025/12/11/2","label":"cve@mitre.org"},{"url":"http://www.openwall.com/lists/oss-security/2025/12/14/1","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.openwall.com/lists/oss-security/2025/12/18/3","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.0047,"epssPercentile":0.38906,"ingestedAt":"2026-10-14T13:30:58.423Z","slug":"CVE-2025-67896","body":"## Overview\n\nExim 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.\n\n## Affected\n\n- `exim < 4.99.1`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `exim 4.99.1`","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}