CVE-2025-67896

Dec. 22, 2025, 7:15 p.m.

7.0
Medium

Description

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.

Product(s) Impacted

Vendor Product Versions
Exim
  • Exim
  • *

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-122
Heap-based Buffer Overflow
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

*CPE(s)

Affected systems and software identified for this CVE.

Type Vendor Product Version Update Edition Language Software Edition Target Software Target Hardware Other Information
a exim exim / / / / / / / /

References

https://exim.org/static/doc/security/
https://exim.org/static/doc/security/EXIM-Security-2025-12-09.1/report.txt
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

Tags

cve@mitre.org
2025-12-14
CVE-2025-67896

CVSS Score

7.0 / 10

CVSS Data - 3.1

  • Attack Vector: NETWORK
  • Attack Complexity: HIGH
  • Privileges Required: NONE
  • Scope: UNCHANGED
  • Confidentiality Impact: LOW
  • Integrity Impact: HIGH
  • Availability Impact: LOW

    • CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L

    View Vector String

Timeline

Published: Dec. 14, 2025, 4:15 a.m.
Last Modified: Dec. 22, 2025, 7:15 p.m.

Status : Analyzed

CVE has had analysis completed and all data associations made.

More info

Source

cve@mitre.org

*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.