# DSA-5597-1: exim4 security update

DSA-5597-1, released January 4, 2024, fixes 1 CVE in exim4. None of them is reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/fix/linux/dsa-5597-1
- Platform: Linux
- Released: Jan 4, 2024
- Priority: Routine (Closes CVE-2023-51766)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://security-tracker.debian.org/tracker/CVE-2023-51766

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [exim4](https://patchblox.com/security/data/product/linux/exim4.md) | Debian 11.6 (bullseye) | 4.94.2-7+deb11u2 |
| [exim4](https://patchblox.com/security/data/product/linux/exim4.md) | Debian 12.15 (bookworm) | 4.96-15+deb12u4 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2023-51766](https://patchblox.com/security/data/cve/CVE-2023-51766.md) | Routine | exim4: Exim before 4.97.1 allows SMTP smuggling in certain PIPELINING/CHUNKING configurations | 5.3 | 0.0110 |  |

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Data as of 2026-11-07T06:34:28Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo