What’s Vulnerable › Vulnerabilities

CVE-2025-67896

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-14 · updated 2026-10-14
• Weakness: CWE-122

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.

Affected products

• Exim: before 4.99.1 — fixed in 4.99.1

How to fix

Upgrade to a fixed version: Exim 4.99.1. Check the vendor advisory for mitigations.

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

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