CVE-2025-67896
HIGH severity · CVSS 7 · CWE-122
7CVSS HIGH
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.
Impact & exploitability
Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
Confidentiality impactLow
Integrity impactHigh
Availability impactLow
Exploit probability (EPSS)0%
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Additional information
- NVD record
- https://exim.org/static/doc/security/Advisory
- https://exim.org/static/doc/security/EXIM-Security-2025-12-09.1/report.txtAdvisory
- https://www.openwall.com/lists/oss-security/2025/12/11/2
- http://www.openwall.com/lists/oss-security/2025/12/14/1
- http://www.openwall.com/lists/oss-security/2025/12/18/3