CVE-2025-67896
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-14

Last updated on: 2025-12-22

Assigner: MITRE

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.
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Meta Information
Published
2025-12-14
Last Modified
2025-12-22
Generated
2026-06-16
AI Q&A
2025-12-14
EPSS Evaluated
2026-06-15
NVD
CVE-2025-67896
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
exim exim to 4.99.1 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-122 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().
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Executive Summary

This vulnerability in Exim versions before 4.99.1 allows remote attackers to cause heap corruption. Further technical details will be provided after 2025-12-18.

Impact Analysis

The vulnerability can lead to remote heap corruption, which may allow attackers to compromise the integrity and availability of the affected system, potentially leading to unauthorized information modification or denial of service.

Mitigation Strategies

The immediate step to mitigate this vulnerability is to update Exim to version 4.99.1 or later, which includes the fix for the remote heap corruption issue. The fixed version will be officially released on December 18, 2025, and can be obtained from the official Exim code repository at https://code.exim.org/exim/exim. [1]

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