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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ISC | BIND9 | 9.14.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | bind9 | 1:9.16.6-1 | — |
| Debian 13 | bind9 | 1:9.16.6-1 | — |
| Debian 12 | bind9 | 1:9.16.6-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | bind9 | 1:9.16.1-0ubuntu2.3 | USN-4468-1 |
| Ubuntu 18.04 LTS | bind9 | 1:9.11.3+dfsg-1ubuntu1.13 | USN-4468-1 |
| Ubuntu 16.04 LTS | bind9 | 1:9.10.3.dfsg.P4-8ubuntu1.17 | USN-4468-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | bind | 9.16.6-12.32.1 | SUSE-SU-2020:2914-1 |
| SLES 15 SP2 | sysuser-tools | 2.0-4.2.8 | SUSE-SU-2020:2914-1 |
| SLES 15 SP1 | bind | 9.16.6-12.32.1 | SUSE-SU-2020:2914-1 |
| SLES 15 SP1 | sysuser-tools | 2.0-4.2.8 | SUSE-SU-2020:2914-1 |
| SLES 15 | bind | 9.16.6-12.32.1 | SUSE-SU-2020:2914-1 |
| SLES 15 | sysuser-tools | 2.0-4.2.8 | SUSE-SU-2020:2914-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 | bind | 9.16.6-12.32.1 | SUSE-SU-2020:2914-1 |
| SLES for SAP 15 | sysuser-tools | 2.0-4.2.8 | SUSE-SU-2020:2914-1 |
| SLE HPC 15 | bind | 9.16.6-12.32.1 | SUSE-SU-2020:2914-1 |
| SLE HPC 15 | sysuser-tools | 2.0-4.2.8 | SUSE-SU-2020:2914-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | bind | 9.16.20-1.4 | openSUSE-SU-2024:10650-1 |
| openSUSE Leap 15.2 | bind | 9.16.6-lp152.14.3.1 | openSUSE-SU-2020:1699-1 |
| openSUSE Leap 15.2 | libuv | 1.18.0-lp152.4.3.1 | openSUSE-SU-2020:1699-1 |
| openSUSE Leap 15.2 | sysuser-tools | 2.0-lp152.5.3.1 | openSUSE-SU-2020:1699-1 |
| openSUSE Leap 15.1 | bind | 9.16.6-lp151.11.9.1 | openSUSE-SU-2020:1701-1 |
| openSUSE Leap 15.1 | libuv | 1.18.0-lp151.3.3.1 | openSUSE-SU-2020:1701-1 |
| openSUSE Leap 15.1 | sysuser-tools | 2.0-lp151.4.3.1 | openSUSE-SU-2020:1701-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | bind | 9.16.6-r0 | — |
| Alpine v3.23 | bind | 9.16.6-r0 | — |
| Alpine v3.22 | bind | 9.16.6-r0 | — |
| Alpine v3.21 | bind | 9.16.6-r0 | — |
| Alpine v3.20 | bind | 9.16.6-r0 | — |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | bind | 9.16.6-r0 | — |
| Alpine v3.18 | bind | 9.16.6-r0 | — |
| Alpine v3.17 | bind | 9.16.6-r0 | — |
| Alpine v3.16 | bind | 9.16.6-r0 | — |
| Alpine v3.15 | bind | 9.16.6-r0 | — |
| Alpine v3.14 | bind | 9.16.6-r0 | — |
| Alpine v3.13 | bind | 9.16.6-r0 | — |
| Alpine v3.12 | bind | 9.16.6-r0 | — |
| Alpine v3.11 | bind | 9.16.6-r0 | — |
| Alpine v3.10 | bind | 9.16.6-r0 | — |
Advisories 5
- USN-4468-1 bind9 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- SUSE-SU-2020:2914-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1699-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10650-1 bind-9.16.20-1.4 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1701-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://kb.isc.org/docs/cve-2020-8621
- https://security.netapp.com/advisory/ntap-20200827-0003/
- USN-4468-1 vendor-advisory
- GLSA-202008-19 vendor-advisory
- https://www.synology.com/security/advisory/Synology_SA_20_19
- openSUSE-SU-2020:1699 vendor-advisory
- openSUSE-SU-2020:1701 vendor-advisory