# DSA-5621-1: bind9 security update

DSA-5621-1, released February 14, 2024, fixes 1 CVE in bind9. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/dsa-5621-1
- Platform: Linux
- Released: Feb 14, 2024
- Priority: High (Closes CVE-2023-4408, high severity)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://security-tracker.debian.org/tracker/CVE-2023-4408

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [bind9](https://patchblox.com/security/data/product/linux/bind9.md) | Debian 11.6 (bullseye) | 1:9.16.48-1 |
| [bind9](https://patchblox.com/security/data/product/linux/bind9.md) | Debian 12.15 (bookworm) | 1:9.18.24-1 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2023-4408](https://patchblox.com/security/data/cve/CVE-2023-4408.md) | High | bind: This update for bind fixes the following issues:   - CVE-2023-4408: Fixed denial of service during DNS message parsin... | 7.5 | 0.0139 |  |

---

Data as of 2026-11-07T12:40:37Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo