Heap Corruption Vulnerability in Exim Mail Transfer Agent
CVE-2025-67896

6.4MEDIUM

Key Information:

Vendor

Exim

Status
Exim
Vendor
CVE Published:
14 December 2025

What is CVE-2025-67896?

A vulnerability in Exim Mail Transfer Agent allows for remote heap corruption, potentially enabling an attacker to exploit this flaw for unauthorized access or denial of service. The issue affects versions prior to 4.99.1, emphasizing the need for users to update to the latest version. Detailed technical insights will be provided in a forthcoming security announcement on December 18, 2025.

Affected Version(s)

Exim 4.99 < 4.99.1

References

https://www.openwall.com/lists/oss-security/2025/12/11/2
https://exim.org/static/doc/security/

CVSS V3.1

Score:
6.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
High
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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CVE-2025-67896 : Heap Corruption Vulnerability in Exim Mail Transfer Agent