# CVE-2021-25215: bind9: In BIND 9.0.0 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BIND 9.9.3-S1 ->9.11.29-S1 and 9.16.8-S1 -> 9.16.13-S1 of B...

CVE-2021-25215 is fixed in 36 products on 1 platform, first by bind9 1:9.11.3+dfsg-1ubuntu1.15, released April 27, 2021. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-25215
- Priority: High
- CVSS: 7.5 (Medium)
- EPSS: 0.1170
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 27, 2021

## Description

In BIND 9.0.0 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BIND 9.9.3-S1 ->9.11.29-S1 and 9.16.8-S1 -> 9.16.13-S1 of BIND Supported Preview Edition,as well as release versions 9.17.0 -> 9.17.11 of the BIND 9.17 developmentbranch, when a vulnerable version of named receives a query for a recordtriggering the flaw described above, the named process will terminate dueto a failed assertion check. The vulnerability affects all currentlymaintained BIND 9 branches (9.11, 9.11-S, 9.16, 9.16-S, 9.17) as well asall other versions of BIND 9.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bind RHEL 8 | 32:9.11.26-4.el8_4 | [RHSA-2021:1989](https://patchblox.com/security/data/fix/linux/rhsa-2021-1989.md) | May 18, 2021 |
| Linux | bind ol 8 | 32:9.11.26-4.el8_4 | [ELSA-2021-1989](https://patchblox.com/security/data/fix/linux/elsa-2021-1989.md) | May 26, 2021 |
| Linux | bind-chroot RHEL 8 | 32:9.11.26-4.el8_4 | [RHSA-2021:1989](https://patchblox.com/security/data/fix/linux/rhsa-2021-1989.md) | May 18, 2021 |
| Linux | bind-chroot ol 8 | 32:9.11.26-4.el8_4 | [ELSA-2021-1989](https://patchblox.com/security/data/fix/linux/elsa-2021-1989.md) | May 26, 2021 |
| Linux | bind-devel RHEL 8 | 32:9.11.26-4.el8_4 | [RHSA-2021:1989](https://patchblox.com/security/data/fix/linux/rhsa-2021-1989.md) | May 18, 2021 |
| Linux | bind-devel ol 8 | 32:9.11.26-4.el8_4 | [ELSA-2021-1989](https://patchblox.com/security/data/fix/linux/elsa-2021-1989.md) | May 26, 2021 |
| Linux | bind-export-devel RHEL 8 | 32:9.11.26-4.el8_4 | [RHSA-2021:1989](https://patchblox.com/security/data/fix/linux/rhsa-2021-1989.md) | May 18, 2021 |
| Linux | bind-export-devel ol 8 | 32:9.11.26-4.el8_4 | [ELSA-2021-1989](https://patchblox.com/security/data/fix/linux/elsa-2021-1989.md) | May 26, 2021 |
| Linux | bind-export-libs RHEL 8 | 32:9.11.26-4.el8_4 | [RHSA-2021:1989](https://patchblox.com/security/data/fix/linux/rhsa-2021-1989.md) | May 18, 2021 |
| Linux | bind-export-libs ol 8 | 32:9.11.26-4.el8_4 | [ELSA-2021-1989](https://patchblox.com/security/data/fix/linux/elsa-2021-1989.md) | May 26, 2021 |
| Linux | bind-libs RHEL 8 | 32:9.11.26-4.el8_4 | [RHSA-2021:1989](https://patchblox.com/security/data/fix/linux/rhsa-2021-1989.md) | May 18, 2021 |
| Linux | bind-libs ol 8 | 32:9.11.26-4.el8_4 | [ELSA-2021-1989](https://patchblox.com/security/data/fix/linux/elsa-2021-1989.md) | May 26, 2021 |
| Linux | bind-libs-lite RHEL 8 | 32:9.11.26-4.el8_4 | [RHSA-2021:1989](https://patchblox.com/security/data/fix/linux/rhsa-2021-1989.md) | May 18, 2021 |
| Linux | bind-libs-lite ol 8 | 32:9.11.26-4.el8_4 | [ELSA-2021-1989](https://patchblox.com/security/data/fix/linux/elsa-2021-1989.md) | May 26, 2021 |
| Linux | bind-license RHEL 8 | 32:9.11.26-4.el8_4 | [RHSA-2021:1989](https://patchblox.com/security/data/fix/linux/rhsa-2021-1989.md) | May 18, 2021 |
| Linux | bind-license ol 8 | 32:9.11.26-4.el8_4 | [ELSA-2021-1989](https://patchblox.com/security/data/fix/linux/elsa-2021-1989.md) | May 26, 2021 |
| Linux | bind-lite-devel RHEL 8 | 32:9.11.26-4.el8_4 | [RHSA-2021:1989](https://patchblox.com/security/data/fix/linux/rhsa-2021-1989.md) | May 18, 2021 |
| Linux | bind-lite-devel ol 8 | 32:9.11.26-4.el8_4 | [ELSA-2021-1989](https://patchblox.com/security/data/fix/linux/elsa-2021-1989.md) | May 26, 2021 |
| Linux | bind-pkcs11 RHEL 8 | 32:9.11.26-4.el8_4 | [RHSA-2021:1989](https://patchblox.com/security/data/fix/linux/rhsa-2021-1989.md) | May 18, 2021 |
| Linux | bind-pkcs11 ol 8 | 32:9.11.26-4.el8_4 | [ELSA-2021-1989](https://patchblox.com/security/data/fix/linux/elsa-2021-1989.md) | May 26, 2021 |
| Linux | bind-pkcs11-devel RHEL 8 | 32:9.11.26-4.el8_4 | [RHSA-2021:1989](https://patchblox.com/security/data/fix/linux/rhsa-2021-1989.md) | May 18, 2021 |
| Linux | bind-pkcs11-devel ol 8 | 32:9.11.26-4.el8_4 | [ELSA-2021-1989](https://patchblox.com/security/data/fix/linux/elsa-2021-1989.md) | May 26, 2021 |
| Linux | bind-pkcs11-libs RHEL 8 | 32:9.11.26-4.el8_4 | [RHSA-2021:1989](https://patchblox.com/security/data/fix/linux/rhsa-2021-1989.md) | May 18, 2021 |
| Linux | bind-pkcs11-libs ol 8 | 32:9.11.26-4.el8_4 | [ELSA-2021-1989](https://patchblox.com/security/data/fix/linux/elsa-2021-1989.md) | May 26, 2021 |
| Linux | bind-pkcs11-utils RHEL 8 | 32:9.11.26-4.el8_4 | [RHSA-2021:1989](https://patchblox.com/security/data/fix/linux/rhsa-2021-1989.md) | May 18, 2021 |
| Linux | bind-pkcs11-utils ol 8 | 32:9.11.26-4.el8_4 | [ELSA-2021-1989](https://patchblox.com/security/data/fix/linux/elsa-2021-1989.md) | May 26, 2021 |
| Linux | bind-sdb RHEL 8 | 32:9.11.26-4.el8_4 | [RHSA-2021:1989](https://patchblox.com/security/data/fix/linux/rhsa-2021-1989.md) | May 18, 2021 |
| Linux | bind-sdb ol 8 | 32:9.11.26-4.el8_4 | [ELSA-2021-1989](https://patchblox.com/security/data/fix/linux/elsa-2021-1989.md) | May 26, 2021 |
| Linux | bind-sdb-chroot RHEL 8 | 32:9.11.26-4.el8_4 | [RHSA-2021:1989](https://patchblox.com/security/data/fix/linux/rhsa-2021-1989.md) | May 18, 2021 |
| Linux | bind-sdb-chroot ol 8 | 32:9.11.26-4.el8_4 | [ELSA-2021-1989](https://patchblox.com/security/data/fix/linux/elsa-2021-1989.md) | May 26, 2021 |
| Linux | bind-utils RHEL 8 | 32:9.11.26-4.el8_4 | [RHSA-2021:1989](https://patchblox.com/security/data/fix/linux/rhsa-2021-1989.md) | May 18, 2021 |
| Linux | bind-utils ol 8 | 32:9.11.26-4.el8_4 | [ELSA-2021-1989](https://patchblox.com/security/data/fix/linux/elsa-2021-1989.md) | May 26, 2021 |
| Linux | bind9 Ubuntu 18.04.6 LTS (bionic) | 1:9.11.3+dfsg-1ubuntu1.15 | [bind9 1:9.11.3+dfsg-1ubuntu1.15](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-bind9-1-9.11.3-dfsg-1ubuntu1.15.md) | Apr 27, 2021 |
| Linux | bind9 Ubuntu 20.04 LTS (focal) | 1:9.16.1-0ubuntu2.8 | [bind9 1:9.16.1-0ubuntu2.8](https://patchblox.com/security/data/fix/linux/ubuntu-focal-bind9-1-9.16.1-0ubuntu2.8.md) | Apr 27, 2021 |
| Linux | bind9 Ubuntu 24.10 (oracular) | 1:9.16.8-1ubuntu3.1 | [bind9 1:9.16.8-1ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-bind9-1-9.16.8-1ubuntu3.1.md) | Apr 28, 2021 |
| Linux | bind9 Ubuntu 25.04 (plucky) | 1:9.16.8-1ubuntu3.1 | [bind9 1:9.16.8-1ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-bind9-1-9.16.8-1ubuntu3.1.md) | Apr 28, 2021 |
| Linux | bind9-dnsutils Ubuntu 20.04 LTS (focal) | 1:9.16.1-0ubuntu2.8 | [bind9-dnsutils 1:9.16.1-0ubuntu2.8](https://patchblox.com/security/data/fix/linux/ubuntu-focal-bind9-dnsutils-1-9.16.1-0ubuntu2.8.md) | Apr 27, 2021 |
| Linux | bind9-dnsutils Ubuntu 24.10 (oracular) | 1:9.16.8-1ubuntu3.1 | [bind9-dnsutils 1:9.16.8-1ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-bind9-dnsutils-1-9.16.8-1ubuntu3.1.md) | Apr 28, 2021 |
| Linux | bind9-dnsutils Ubuntu 25.04 (plucky) | 1:9.16.8-1ubuntu3.1 | [bind9-dnsutils 1:9.16.8-1ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-bind9-dnsutils-1-9.16.8-1ubuntu3.1.md) | Apr 28, 2021 |
| Linux | bind9-host Ubuntu 18.04.6 LTS (bionic) | 1:9.11.3+dfsg-1ubuntu1.15 | [bind9-host 1:9.11.3+dfsg-1ubuntu1.15](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-bind9-host-1-9.11.3-dfsg-1ubuntu1.15.md) | Apr 27, 2021 |
| Linux | bind9-host Ubuntu 20.04 LTS (focal) | 1:9.16.1-0ubuntu2.8 | [bind9-host 1:9.16.1-0ubuntu2.8](https://patchblox.com/security/data/fix/linux/ubuntu-focal-bind9-host-1-9.16.1-0ubuntu2.8.md) | Apr 27, 2021 |
| Linux | bind9-host Ubuntu 24.10 (oracular) | 1:9.16.8-1ubuntu3.1 | [bind9-host 1:9.16.8-1ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-bind9-host-1-9.16.8-1ubuntu3.1.md) | Apr 28, 2021 |
| Linux | bind9-host Ubuntu 25.04 (plucky) | 1:9.16.8-1ubuntu3.1 | [bind9-host 1:9.16.8-1ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-bind9-host-1-9.16.8-1ubuntu3.1.md) | Apr 28, 2021 |
| Linux | bind9-libs Ubuntu 20.04 LTS (focal) | 1:9.16.1-0ubuntu2.8 | [bind9-libs 1:9.16.1-0ubuntu2.8](https://patchblox.com/security/data/fix/linux/ubuntu-focal-bind9-libs-1-9.16.1-0ubuntu2.8.md) | Apr 27, 2021 |
| Linux | bind9-libs Ubuntu 24.10 (oracular) | 1:9.16.8-1ubuntu3.1 | [bind9-libs 1:9.16.8-1ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-bind9-libs-1-9.16.8-1ubuntu3.1.md) | Apr 28, 2021 |
| Linux | bind9-libs Ubuntu 25.04 (plucky) | 1:9.16.8-1ubuntu3.1 | [bind9-libs 1:9.16.8-1ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-bind9-libs-1-9.16.8-1ubuntu3.1.md) | Apr 28, 2021 |
| Linux | bind9-utils Ubuntu 20.04 LTS (focal) | 1:9.16.1-0ubuntu2.8 | [bind9-utils 1:9.16.1-0ubuntu2.8](https://patchblox.com/security/data/fix/linux/ubuntu-focal-bind9-utils-1-9.16.1-0ubuntu2.8.md) | Apr 27, 2021 |
| Linux | bind9-utils Ubuntu 24.10 (oracular) | 1:9.16.8-1ubuntu3.1 | [bind9-utils 1:9.16.8-1ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-bind9-utils-1-9.16.8-1ubuntu3.1.md) | Apr 28, 2021 |
| Linux | bind9-utils Ubuntu 25.04 (plucky) | 1:9.16.8-1ubuntu3.1 | [bind9-utils 1:9.16.8-1ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-bind9-utils-1-9.16.8-1ubuntu3.1.md) | Apr 28, 2021 |
| Linux | bind9utils Ubuntu 18.04.6 LTS (bionic) | 1:9.11.3+dfsg-1ubuntu1.15 | [bind9utils 1:9.11.3+dfsg-1ubuntu1.15](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-bind9utils-1-9.11.3-dfsg-1ubuntu1.15.md) | Apr 27, 2021 |
| Linux | bind9utils Ubuntu 20.04 LTS (focal) | 1:9.16.1-0ubuntu2.8 | [bind9utils 1:9.16.1-0ubuntu2.8](https://patchblox.com/security/data/fix/linux/ubuntu-focal-bind9utils-1-9.16.1-0ubuntu2.8.md) | Apr 27, 2021 |
| Linux | bind9utils Ubuntu 24.10 (oracular) | 1:9.16.8-1ubuntu3.1 | [bind9utils 1:9.16.8-1ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-bind9utils-1-9.16.8-1ubuntu3.1.md) | Apr 28, 2021 |
| Linux | bind9utils Ubuntu 25.04 (plucky) | 1:9.16.8-1ubuntu3.1 | [bind9utils 1:9.16.8-1ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-bind9utils-1-9.16.8-1ubuntu3.1.md) | Apr 28, 2021 |
| Linux | dnsutils Ubuntu 18.04.6 LTS (bionic) | 1:9.11.3+dfsg-1ubuntu1.15 | [dnsutils 1:9.11.3+dfsg-1ubuntu1.15](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-dnsutils-1-9.11.3-dfsg-1ubuntu1.15.md) | Apr 27, 2021 |
| Linux | dnsutils Ubuntu 20.04 LTS (focal) | 1:9.16.1-0ubuntu2.8 | [dnsutils 1:9.16.1-0ubuntu2.8](https://patchblox.com/security/data/fix/linux/ubuntu-focal-dnsutils-1-9.16.1-0ubuntu2.8.md) | Apr 27, 2021 |
| Linux | dnsutils Ubuntu 24.10 (oracular) | 1:9.16.8-1ubuntu3.1 | [dnsutils 1:9.16.8-1ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-dnsutils-1-9.16.8-1ubuntu3.1.md) | Apr 28, 2021 |
| Linux | dnsutils Ubuntu 25.04 (plucky) | 1:9.16.8-1ubuntu3.1 | [dnsutils 1:9.16.8-1ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-dnsutils-1-9.16.8-1ubuntu3.1.md) | Apr 28, 2021 |
| Linux | libbind9-160 Ubuntu 18.04.6 LTS (bionic) | 1:9.11.3+dfsg-1ubuntu1.15 | [libbind9-160 1:9.11.3+dfsg-1ubuntu1.15](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libbind9-160-1-9.11.3-dfsg-1ubuntu1.15.md) | Apr 27, 2021 |
| Linux | libdns-export1100 Ubuntu 18.04.6 LTS (bionic) | 1:9.11.3+dfsg-1ubuntu1.15 | [libdns-export1100 1:9.11.3+dfsg-1ubuntu1.15](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libdns-export1100-1-9.11.3-dfsg-1ubuntu1.15.md) | Apr 27, 2021 |
| Linux | libdns1100 Ubuntu 18.04.6 LTS (bionic) | 1:9.11.3+dfsg-1ubuntu1.15 | [libdns1100 1:9.11.3+dfsg-1ubuntu1.15](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libdns1100-1-9.11.3-dfsg-1ubuntu1.15.md) | Apr 27, 2021 |
| Linux | libirs-export160 Ubuntu 18.04.6 LTS (bionic) | 1:9.11.3+dfsg-1ubuntu1.15 | [libirs-export160 1:9.11.3+dfsg-1ubuntu1.15](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libirs-export160-1-9.11.3-dfsg-1ubuntu1.15.md) | Apr 27, 2021 |
| Linux | libirs160 Ubuntu 18.04.6 LTS (bionic) | 1:9.11.3+dfsg-1ubuntu1.15 | [libirs160 1:9.11.3+dfsg-1ubuntu1.15](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libirs160-1-9.11.3-dfsg-1ubuntu1.15.md) | Apr 27, 2021 |
| Linux | libisc-export169 Ubuntu 18.04.6 LTS (bionic) | 1:9.11.3+dfsg-1ubuntu1.15 | [libisc-export169 1:9.11.3+dfsg-1ubuntu1.15](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libisc-export169-1-9.11.3-dfsg-1ubuntu1.15.md) | Apr 27, 2021 |
| Linux | libisc169 Ubuntu 18.04.6 LTS (bionic) | 1:9.11.3+dfsg-1ubuntu1.15 | [libisc169 1:9.11.3+dfsg-1ubuntu1.15](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libisc169-1-9.11.3-dfsg-1ubuntu1.15.md) | Apr 27, 2021 |
| Linux | libisccc-export160 Ubuntu 18.04.6 LTS (bionic) | 1:9.11.3+dfsg-1ubuntu1.15 | [libisccc-export160 1:9.11.3+dfsg-1ubuntu1.15](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libisccc-export160-1-9.11.3-dfsg-1ubuntu1.15.md) | Apr 27, 2021 |
| Linux | libisccc160 Ubuntu 18.04.6 LTS (bionic) | 1:9.11.3+dfsg-1ubuntu1.15 | [libisccc160 1:9.11.3+dfsg-1ubuntu1.15](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libisccc160-1-9.11.3-dfsg-1ubuntu1.15.md) | Apr 27, 2021 |
| Linux | libisccfg-export160 Ubuntu 18.04.6 LTS (bionic) | 1:9.11.3+dfsg-1ubuntu1.15 | [libisccfg-export160 1:9.11.3+dfsg-1ubuntu1.15](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libisccfg-export160-1-9.11.3-dfsg-1ubuntu1.15.md) | Apr 27, 2021 |
| Linux | libisccfg160 Ubuntu 18.04.6 LTS (bionic) | 1:9.11.3+dfsg-1ubuntu1.15 | [libisccfg160 1:9.11.3+dfsg-1ubuntu1.15](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libisccfg160-1-9.11.3-dfsg-1ubuntu1.15.md) | Apr 27, 2021 |
| Linux | liblwres160 Ubuntu 18.04.6 LTS (bionic) | 1:9.11.3+dfsg-1ubuntu1.15 | [liblwres160 1:9.11.3+dfsg-1ubuntu1.15](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-liblwres160-1-9.11.3-dfsg-1ubuntu1.15.md) | Apr 27, 2021 |
| Linux | python3-bind RHEL 8 | 32:9.11.26-4.el8_4 | [RHSA-2021:1989](https://patchblox.com/security/data/fix/linux/rhsa-2021-1989.md) | May 18, 2021 |
| Linux | python3-bind ol 8 | 32:9.11.26-4.el8_4 | [ELSA-2021-1989](https://patchblox.com/security/data/fix/linux/elsa-2021-1989.md) | May 26, 2021 |

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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