# CVE-2023-2911: bind9-host: If the `recursive-clients` quota is reached on a BIND 9 resolver configuredwith both `stale-answer-enable yes;` and `...

CVE-2023-2911 is fixed in 37 products on 1 platform, first by bind9 1:9.16.1-0ubuntu2.15, released June 20, 2023. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2023-2911
- Priority: High
- CVSS: 7.5 (Medium)
- EPSS: 0.0243
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 20, 2023

## Description

If the `recursive-clients` quota is reached on a BIND 9 resolver configuredwith both `stale-answer-enable yes;` and `stale-answer-client-timeout 0;`,a sequence of serve-stale-related lookups could cause `named` to loop andterminate unexpectedly due to a stack overflow.This issue affects BIND 9 versions 9.16.33 through 9.16.41, 9.18.7 through9.18.15, 9.16.33-S1 through 9.16.41-S1, and 9.18.11-S1 through 9.18.15-S1.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bind amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-chroot amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-debuginfo amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-debugsource amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-devel amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-dlz-filesystem amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-dlz-filesystem-debuginfo amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-dlz-ldap amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-dlz-ldap-debuginfo amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-dlz-mysql amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-dlz-mysql-debuginfo amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-dlz-sqlite3 amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-dlz-sqlite3-debuginfo amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-dnssec-doc amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-dnssec-utils amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-dnssec-utils-debuginfo amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-doc amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-libs amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-libs-debuginfo amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-license amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-pkcs11 amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-pkcs11-debuginfo amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-pkcs11-devel amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-pkcs11-libs amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-pkcs11-libs-debuginfo amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-pkcs11-utils amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-pkcs11-utils-debuginfo amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-utils amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind-utils-debuginfo amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |
| Linux | bind9 Debian 12.15 (bookworm) | 1:9.18.16-1~deb12u1 | [DEBIAN-CVE-2023-2911](https://patchblox.com/security/data/fix/linux/debian-cve-2023-2911.md) | Jun 21, 2023 |
| Linux | bind9 Debian 13.5 (trixie) | 1:9.18.16-1 | [DEBIAN-CVE-2023-2911](https://patchblox.com/security/data/fix/linux/debian-cve-2023-2911.md) | Jun 21, 2023 |
| Linux | bind9 Debian 14 | 1:9.18.16-1 | [DEBIAN-CVE-2023-2911](https://patchblox.com/security/data/fix/linux/debian-cve-2023-2911.md) | Jun 21, 2023 |
| Linux | bind9 Ubuntu 20.04 LTS (focal) | 1:9.16.1-0ubuntu2.15 | [bind9 1:9.16.1-0ubuntu2.15](https://patchblox.com/security/data/fix/linux/ubuntu-focal-bind9-1-9.16.1-0ubuntu2.15.md) | Jun 20, 2023 |
| Linux | bind9 Ubuntu 22.04.1 LTS (jammy) | 1:9.18.12-0ubuntu0.22.04.2 | [bind9 1:9.18.12-0ubuntu0.22.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-bind9-1-9.18.12-0ubuntu0.22.04.2.md) | Jun 20, 2023 |
| Linux | bind9 Ubuntu 24.10 (oracular) | 1:9.18.12-1ubuntu2 | [bind9 1:9.18.12-1ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-bind9-1-9.18.12-1ubuntu2.md) | Jun 21, 2023 |
| Linux | bind9 Ubuntu 25.04 (plucky) | 1:9.18.12-1ubuntu2 | [bind9 1:9.18.12-1ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-bind9-1-9.18.12-1ubuntu2.md) | Jun 21, 2023 |
| Linux | bind9-dnsutils Ubuntu 20.04 LTS (focal) | 1:9.16.1-0ubuntu2.15 | [bind9-dnsutils 1:9.16.1-0ubuntu2.15](https://patchblox.com/security/data/fix/linux/ubuntu-focal-bind9-dnsutils-1-9.16.1-0ubuntu2.15.md) | Jun 20, 2023 |
| Linux | bind9-dnsutils Ubuntu 22.04.1 LTS (jammy) | 1:9.18.12-0ubuntu0.22.04.2 | [bind9-dnsutils 1:9.18.12-0ubuntu0.22.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-bind9-dnsutils-1-9.18.12-0ubuntu0.22.04.2.md) | Jun 20, 2023 |
| Linux | bind9-dnsutils Ubuntu 24.10 (oracular) | 1:9.18.12-1ubuntu2 | [bind9-dnsutils 1:9.18.12-1ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-bind9-dnsutils-1-9.18.12-1ubuntu2.md) | Jun 21, 2023 |
| Linux | bind9-dnsutils Ubuntu 25.04 (plucky) | 1:9.18.12-1ubuntu2 | [bind9-dnsutils 1:9.18.12-1ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-bind9-dnsutils-1-9.18.12-1ubuntu2.md) | Jun 21, 2023 |
| Linux | bind9-host Ubuntu 20.04 LTS (focal) | 1:9.16.1-0ubuntu2.15 | [bind9-host 1:9.16.1-0ubuntu2.15](https://patchblox.com/security/data/fix/linux/ubuntu-focal-bind9-host-1-9.16.1-0ubuntu2.15.md) | Jun 20, 2023 |
| Linux | bind9-host Ubuntu 22.04.1 LTS (jammy) | 1:9.18.12-0ubuntu0.22.04.2 | [bind9-host 1:9.18.12-0ubuntu0.22.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-bind9-host-1-9.18.12-0ubuntu0.22.04.2.md) | Jun 20, 2023 |
| Linux | bind9-host Ubuntu 24.10 (oracular) | 1:9.18.12-1ubuntu2 | [bind9-host 1:9.18.12-1ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-bind9-host-1-9.18.12-1ubuntu2.md) | Jun 21, 2023 |
| Linux | bind9-host Ubuntu 25.04 (plucky) | 1:9.18.12-1ubuntu2 | [bind9-host 1:9.18.12-1ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-bind9-host-1-9.18.12-1ubuntu2.md) | Jun 21, 2023 |
| Linux | bind9-libs Ubuntu 20.04 LTS (focal) | 1:9.16.1-0ubuntu2.15 | [bind9-libs 1:9.16.1-0ubuntu2.15](https://patchblox.com/security/data/fix/linux/ubuntu-focal-bind9-libs-1-9.16.1-0ubuntu2.15.md) | Jun 20, 2023 |
| Linux | bind9-libs Ubuntu 22.04.1 LTS (jammy) | 1:9.18.12-0ubuntu0.22.04.2 | [bind9-libs 1:9.18.12-0ubuntu0.22.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-bind9-libs-1-9.18.12-0ubuntu0.22.04.2.md) | Jun 20, 2023 |
| Linux | bind9-libs Ubuntu 24.10 (oracular) | 1:9.18.12-1ubuntu2 | [bind9-libs 1:9.18.12-1ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-bind9-libs-1-9.18.12-1ubuntu2.md) | Jun 21, 2023 |
| Linux | bind9-libs Ubuntu 25.04 (plucky) | 1:9.18.12-1ubuntu2 | [bind9-libs 1:9.18.12-1ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-bind9-libs-1-9.18.12-1ubuntu2.md) | Jun 21, 2023 |
| Linux | bind9-utils Ubuntu 20.04 LTS (focal) | 1:9.16.1-0ubuntu2.15 | [bind9-utils 1:9.16.1-0ubuntu2.15](https://patchblox.com/security/data/fix/linux/ubuntu-focal-bind9-utils-1-9.16.1-0ubuntu2.15.md) | Jun 20, 2023 |
| Linux | bind9-utils Ubuntu 22.04.1 LTS (jammy) | 1:9.18.12-0ubuntu0.22.04.2 | [bind9-utils 1:9.18.12-0ubuntu0.22.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-bind9-utils-1-9.18.12-0ubuntu0.22.04.2.md) | Jun 20, 2023 |
| Linux | bind9-utils Ubuntu 24.10 (oracular) | 1:9.18.12-1ubuntu2 | [bind9-utils 1:9.18.12-1ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-bind9-utils-1-9.18.12-1ubuntu2.md) | Jun 21, 2023 |
| Linux | bind9-utils Ubuntu 25.04 (plucky) | 1:9.18.12-1ubuntu2 | [bind9-utils 1:9.18.12-1ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-bind9-utils-1-9.18.12-1ubuntu2.md) | Jun 21, 2023 |
| Linux | bind9utils Ubuntu 20.04 LTS (focal) | 1:9.16.1-0ubuntu2.15 | [bind9utils 1:9.16.1-0ubuntu2.15](https://patchblox.com/security/data/fix/linux/ubuntu-focal-bind9utils-1-9.16.1-0ubuntu2.15.md) | Jun 20, 2023 |
| Linux | bind9utils Ubuntu 22.04.1 LTS (jammy) | 1:9.18.12-0ubuntu0.22.04.2 | [bind9utils 1:9.18.12-0ubuntu0.22.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-bind9utils-1-9.18.12-0ubuntu0.22.04.2.md) | Jun 20, 2023 |
| Linux | bind9utils Ubuntu 24.10 (oracular) | 1:9.18.12-1ubuntu2 | [bind9utils 1:9.18.12-1ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-bind9utils-1-9.18.12-1ubuntu2.md) | Jun 21, 2023 |
| Linux | bind9utils Ubuntu 25.04 (plucky) | 1:9.18.12-1ubuntu2 | [bind9utils 1:9.18.12-1ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-bind9utils-1-9.18.12-1ubuntu2.md) | Jun 21, 2023 |
| Linux | dnsutils Ubuntu 20.04 LTS (focal) | 1:9.16.1-0ubuntu2.15 | [dnsutils 1:9.16.1-0ubuntu2.15](https://patchblox.com/security/data/fix/linux/ubuntu-focal-dnsutils-1-9.16.1-0ubuntu2.15.md) | Jun 20, 2023 |
| Linux | dnsutils Ubuntu 22.04.1 LTS (jammy) | 1:9.18.12-0ubuntu0.22.04.2 | [dnsutils 1:9.18.12-0ubuntu0.22.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-dnsutils-1-9.18.12-0ubuntu0.22.04.2.md) | Jun 20, 2023 |
| Linux | dnsutils Ubuntu 24.10 (oracular) | 1:9.18.12-1ubuntu2 | [dnsutils 1:9.18.12-1ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-dnsutils-1-9.18.12-1ubuntu2.md) | Jun 21, 2023 |
| Linux | dnsutils Ubuntu 25.04 (plucky) | 1:9.18.12-1ubuntu2 | [dnsutils 1:9.18.12-1ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-dnsutils-1-9.18.12-1ubuntu2.md) | Jun 21, 2023 |
| Linux | python3-bind amzn 2023 | 32:9.16.42-1.amzn2023.0.1 | [ALAS2023-2023-240](https://patchblox.com/security/data/fix/linux/alas2023-2023-240.md) | Jul 5, 2023 |

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