CVE-2025-67896

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2025-67896
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.

7.0 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 2.2 / Impact : 4.7

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact HIGH

Availability Impact LOW

Scope UNCHANGED

References
Link Resource
https://exim.org/static/doc/security/ Vendor Advisory
https://exim.org/static/doc/security/EXIM-Security-2025-12-09.1/report.txt Vendor Advisory
https://www.openwall.com/lists/oss-security/2025/12/11/2 Mailing List
http://www.openwall.com/lists/oss-security/2025/12/14/1 Mailing List
http://www.openwall.com/lists/oss-security/2025/12/18/3 Mailing List
Configurations

Configuration 1 (hide)

cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*
History

22 Dec 2025, 19:15

Type Values Removed Values Added
References () https://exim.org/static/doc/security/ - () https://exim.org/static/doc/security/ - Vendor Advisory
References () https://exim.org/static/doc/security/EXIM-Security-2025-12-09.1/report.txt - () https://exim.org/static/doc/security/EXIM-Security-2025-12-09.1/report.txt - Vendor Advisory
References () https://www.openwall.com/lists/oss-security/2025/12/11/2 - () https://www.openwall.com/lists/oss-security/2025/12/11/2 - Mailing List
References () http://www.openwall.com/lists/oss-security/2025/12/14/1 - () http://www.openwall.com/lists/oss-security/2025/12/14/1 - Mailing List
References () http://www.openwall.com/lists/oss-security/2025/12/18/3 - () http://www.openwall.com/lists/oss-security/2025/12/18/3 - Mailing List
CPE cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*
First Time Exim
Exim exim

18 Dec 2025, 23:15

Type Values Removed Values Added
References
  • () http://www.openwall.com/lists/oss-security/2025/12/18/3 -

18 Dec 2025, 18:15

Type Values Removed Values Added
CVSS v2 : unknown
v3 : 6.4 		v2 : unknown
v3 : 7.0
References
  • () https://exim.org/static/doc/security/EXIM-Security-2025-12-09.1/report.txt -
Summary (en) Exim before 4.99.1 allows remote heap corruption that will be further described on 2025-12-18. (en) 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.

14 Dec 2025, 14:15

Type Values Removed Values Added
References
  • () http://www.openwall.com/lists/oss-security/2025/12/14/1 -

14 Dec 2025, 04:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-12-14 04:15

Updated : 2025-12-22 19:15

NVD link : CVE-2025-67896

Mitre link : CVE-2025-67896

CVE.ORG link : CVE-2025-67896

JSON object : View

Products Affected

exim

  • exim
CWE
CWE-122

Heap-based Buffer Overflow