# opensmtpd security updates

Patch Radar has 8 security fixes for opensmtpd, closing 5 CVEs, 1 of which is being exploited. The newest is opensmtpd 6.6.4p1-1 (6.6.4p1-1), released January 16, 2026.

- Web page: https://patchblox.com/security/product/linux/opensmtpd
- Platform: Linux
- Supported: yes

## Security fixes, newest first

| Fix | Released | Fixed in | Priority | CVEs | Exploited |
|---|---|---|---|---:|---:|
| [opensmtpd 6.6.4p1-1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-opensmtpd-6.6.4p1-1.md) | Jan 16, 2026 | Ubuntu 25.04 (plucky) 6.6.4p1-1 | High | 2 | 0 |
| [opensmtpd 6.6.4p1-1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-opensmtpd-6.6.4p1-1.md) | Jan 16, 2026 | Ubuntu 24.10 (oracular) 6.6.4p1-1 | High | 2 | 0 |
| [DEBIAN-CVE-2025-62875](https://patchblox.com/security/data/fix/linux/debian-cve-2025-62875.md) | Nov 20, 2025 | Debian 14 7.8.0p0-1 | Routine | 1 | 0 |
| [DEBIAN-CVE-2023-29323](https://patchblox.com/security/data/fix/linux/debian-cve-2023-29323.md) | Apr 4, 2023 | Debian 13.5 (trixie) 7.3.0p1-1 | High | 1 | 0 |
| [DEBIAN-CVE-2023-29323](https://patchblox.com/security/data/fix/linux/debian-cve-2023-29323.md) | Apr 4, 2023 | Debian 14 7.3.0p1-1 | High | 1 | 0 |
| [opensmtpd 6.0.3p1-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-opensmtpd-6.0.3p1-1ubuntu0.2.md) | Feb 25, 2020 | Ubuntu 18.04.6 LTS (bionic) 6.0.3p1-1ubuntu0.2 | High | 2 | 0 |
| [opensmtpd 6.6.4p1-1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-opensmtpd-6.6.4p1-1.md) | Feb 25, 2020 | Ubuntu 20.04 LTS (focal) 6.6.4p1-1 | High | 2 | 0 |
| [opensmtpd 6.0.3p1-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-opensmtpd-6.0.3p1-1ubuntu0.1.md) | Jan 29, 2020 | Ubuntu 18.04.6 LTS (bionic) 6.0.3p1-1ubuntu0.1 | Patch now | 1 | 1 |

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Data as of 2026-11-06T17:00:54Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo