# CVE-2020-8621: bind9: In BIND 9.14.0 -> 9.16.5, 9.17.0 -> 9.17.3, If a server is configured with both QNAME minimization and 'forward...

CVE-2020-8621 is fixed in 7 products on 1 platform, first by bind9 1:9.16.1-0ubuntu2.3, released August 19, 2020. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2020-8621
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0307
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 19, 2020

## Description

In BIND 9.14.0 -> 9.16.5, 9.17.0 -> 9.17.3, If a server is configured with both QNAME minimization and 'forward first' then an attacker who can send queries to it may be able to trigger the condition that will cause the server to crash. Servers that 'forward only' are not affected.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bind9 Ubuntu 20.04 LTS (focal) | 1:9.16.1-0ubuntu2.3 | [bind9 1:9.16.1-0ubuntu2.3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-bind9-1-9.16.1-0ubuntu2.3.md) | Aug 19, 2020 |
| Linux | bind9-dnsutils Ubuntu 20.04 LTS (focal) | 1:9.16.1-0ubuntu2.3 | [bind9-dnsutils 1:9.16.1-0ubuntu2.3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-bind9-dnsutils-1-9.16.1-0ubuntu2.3.md) | Aug 19, 2020 |
| Linux | bind9-host Ubuntu 20.04 LTS (focal) | 1:9.16.1-0ubuntu2.3 | [bind9-host 1:9.16.1-0ubuntu2.3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-bind9-host-1-9.16.1-0ubuntu2.3.md) | Aug 19, 2020 |
| Linux | bind9-libs Ubuntu 20.04 LTS (focal) | 1:9.16.1-0ubuntu2.3 | [bind9-libs 1:9.16.1-0ubuntu2.3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-bind9-libs-1-9.16.1-0ubuntu2.3.md) | Aug 19, 2020 |
| Linux | bind9-utils Ubuntu 20.04 LTS (focal) | 1:9.16.1-0ubuntu2.3 | [bind9-utils 1:9.16.1-0ubuntu2.3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-bind9-utils-1-9.16.1-0ubuntu2.3.md) | Aug 19, 2020 |
| Linux | bind9utils Ubuntu 20.04 LTS (focal) | 1:9.16.1-0ubuntu2.3 | [bind9utils 1:9.16.1-0ubuntu2.3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-bind9utils-1-9.16.1-0ubuntu2.3.md) | Aug 19, 2020 |
| Linux | dnsutils Ubuntu 20.04 LTS (focal) | 1:9.16.1-0ubuntu2.3 | [dnsutils 1:9.16.1-0ubuntu2.3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-dnsutils-1-9.16.1-0ubuntu2.3.md) | Aug 19, 2020 |

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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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