Home/CVE/Exim before 4.99.1, with certain non-default rate-limit configurations, allows a remote heap-based buffer overflow becau
CVE

CVE-2025-67896

Exim before 4.99.1, with certain non-default rate-limit configurations, allows a remote heap-based buffer overflow becau

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.

HIGH · CVSS 7 EPSS 0.00074
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-122Heap-based Buffer Overflow
▤

Affected Products & Versions

1
exim< 4.99.1
▣

Scoring & Timeline

7
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD14 Dec 2025 · 04:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

5
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://exim.org/static/doc/security/Vendor Advisory
https://exim.org/static/doc/security/EXIM-Security-2025-12-09.1/report.txtVendor Advisory
https://www.openwall.com/lists/oss-security/2025/12/11/2Mailing List
http://www.openwall.com/lists/oss-security/2025/12/14/1Mailing List
http://www.openwall.com/lists/oss-security/2025/12/18/3Mailing List
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