# CVE-2025-67896: exim4: Exim before 4.99.1, with certain non-default rate-limit configurations, allows a remote heap-based buffer overflow be...

CVE-2025-67896 is fixed in exim4 on 1 platform by DEBIAN-CVE-2025-67896 (version 4.99-7), released December 14, 2025. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2025-67896
- Priority: Urgent
- CVSS: 9.8 (critical)
- EPSS: 0.0047
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 14, 2025

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | exim4 Debian 14 | 4.99-7 | [DEBIAN-CVE-2025-67896](https://patchblox.com/security/data/fix/linux/debian-cve-2025-67896.md) | Dec 14, 2025 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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