CVE-2025-67896: Update: CVE-2025-67896: EXIM-Security-2025-12-09.1: Exim 4.99: mote heap corruption
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Eximto a version that resolves this vulnerability.Fixed in 4.99.1Patch EXIM-Security-2025-12-09.1
Event History
Frequently Asked Questions
What is the severity of CVE-2025-67896?
CVE-2025-67896 is classified as a high severity vulnerability due to the potential for remote heap corruption.
How do I fix CVE-2025-67896?
The only effective fix for CVE-2025-67896 is to upgrade to Exim version 4.99.1 or later.
Who is affected by CVE-2025-67896?
CVE-2025-67896 affects Exim versions prior to 4.99.1.
What kind of attack does CVE-2025-67896 allow?
CVE-2025-67896 allows for remote heap corruption, which could lead to exploitation and denial of service.
When was CVE-2025-67896 disclosed?
CVE-2025-67896 is scheduled for further detailed description and disclosure on December 18, 2025.