Description
By design, BIND is intended to limit the number of TCP clients that can be connected at any given time. The number of allowed connections is a tunable parameter which, if unset, defaults to a conservative value for most servers. Unfortunately, the code which was intended to limit the number of simultaneous connections contained an error which could be exploited to grow the number of simultaneous connections beyond this limit. Versions affected: BIND 9.9.0 -> 9.10.8-P1, 9.11.0 -> 9.11.6, 9.12.0 -> 9.12.4, 9.14.0. BIND 9 Supported Preview Edition versions 9.9.3-S1 -> 9.11.5-S3, and 9.11.5-S5. Versions 9.13.0 -> 9.13.7 of the 9.13 development branch are also affected. Versions prior to BIND 9.9.0 have not been evaluated for vulnerability to CVE-2018-5743.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ISC | BIND 9 | BIND 9.9.0 -> 9.10.8-P1, 9.11.0 -> 9.11.6, 9.12.0 -> 9.12.4, 9.14.0. BIND 9 Supported Preview Edition versions 9.9.3-S1 -> 9.11.5-S3, and 9.11.5-S5. Versions 9.13.0 -> 9.13.7 of the 9.13 development branch are also affected. Versions prior to BIND 9.9.0 have not been evaluated for vulnerability to … | — |
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 | 1:9.11.5.P4+dfsg-4 | — |
| Debian 13 | bind9 | 1:9.11.5.P4+dfsg-4 | — |
| Debian 12 | bind9 | 1:9.11.5.P4+dfsg-4 | — |
| Debian 9 | bind9 | 1:9.10.3.dfsg.P4-12.3+deb9u5 | DSA-4440-1 |
| Debian 8 | bind9 | 1:9.9.5.dfsg-9+deb8u18 | DLA-1859-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | bind9 | 1:9.11.3+dfsg-1ubuntu1.7 | USN-3956-1 |
| Ubuntu 16.04 LTS | bind9 | 1:9.10.3.dfsg.P4-8ubuntu1.14 | USN-3956-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | bind9 | 1:9.9.5.dfsg-3ubuntu0.19+esm1 | USN-3956-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | bind +16 | 32:9.11.4-17.P2.el8_0 | RHSA-2019:1145 |
| RHEL 7 | bind +13 | 32:9.9.4-74.el7_6.1 | RHSA-2019:1294 |
| RHEL 6 | bind +5 | 32:9.8.2-0.68.rc1.el6_10.3 | RHSA-2019:1492 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7.5 EUS | bind +13 | 32:9.9.4-61.el7_5.2 | RHSA-2019:2977 |
| RHEL 7.4 EUS | bind +13 | 32:9.9.4-51.el7_4.3 | RHSA-2019:2698 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | bind | 9.11.2-12.11.2 | SUSE-SU-2019:1407-1 |
| SLES 15 | bind | 9.11.2-12.11.2 | SUSE-SU-2019:1407-1 |
| SLES 12 SP4 | bind | 9.11.2-3.10.1 | SUSE-SU-2019:2502-1 |
| SLES 12 | bind | 9.9.9P1-28.42.1 | SUSE-SU-2019:1449-1 |
| SLES 11 SP4 | bind | 9.9.6P1-0.51.15.4 | SUSE-SU-2019:14074-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP4 | bind | 9.11.2-3.10.1 | SUSE-SU-2019:2502-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | bind | 9.9.6P1-0.51.15.4 | SUSE-SU-2019:14074-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | bind | 9.16.20-1.4 | openSUSE-SU-2024:10650-1 |
| openSUSE Leap 15.1 | bind | 9.11.2-lp151.11.3.1 | openSUSE-SU-2019:1533-1 |
| openSUSE Leap 15.0 | bind | 9.11.2-lp151.11.3.1 | openSUSE-SU-2019:1533-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | bind | 9.14.1-r0 | — |
| Alpine v3.23 | bind | 9.14.1-r0 | — |
| Alpine v3.22 | bind | 9.14.1-r0 | — |
| Alpine v3.21 | bind | 9.14.1-r0 | — |
| Alpine v3.20 | bind | 9.14.1-r0 | — |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | bind | 9.14.1-r0 | — |
| Alpine v3.18 | bind | 9.14.1-r0 | — |
| Alpine v3.17 | bind | 9.14.1-r0 | — |
| Alpine v3.16 | bind | 9.14.1-r0 | — |
| Alpine v3.15 | bind | 9.14.1-r0 | — |
| Alpine v3.14 | bind | 9.14.1-r0 | — |
| Alpine v3.13 | bind | 9.14.1-r0 | — |
| Alpine v3.12 | bind | 9.14.1-r0 | — |
| Alpine v3.11 | bind | 9.14.1-r0 | — |
| Alpine v3.10 | bind | 9.14.1-r0 | — |
| Alpine v3.9 | bind | 9.12.4_p1-r0 | — |
| Alpine v3.8 | bind | 9.12.4_p1-r0 | — |
| Alpine v3.7 | bind | 9.11.6_p1-r0 | — |
| Alpine v3.6 | bind | 9.11.6_p1-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | bind +13 | 32:9.9.4-74.amzn2.1.2 | ALAS2-2019-1231 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | bind +16 | 32:9.11.4-17.P2.el8_0 | ELSA-2019-1145 |
| Oracle Linux 7 | bind +13 | 32:9.9.4-74.el7_6.1 | ELSA-2019-1294 |
Advisories 20
- RHSA-2019:1294 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2019:1492 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2019:1145 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2019:2698 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2019:2977 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-3956-2 bind9 vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3956-1 bind9 vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4440-1 bind9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1859-1 bind9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2019:14074-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1407-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1533-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1449-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2502-1 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
- WID-SEC-2025-1196 Internet Systems Consortium BIND: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · May 29, 2025
- WID-SEC-2025-1195 Internet Systems Consortium BIND: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · May 29, 2025
- ELSA-2019-1145 Important: bind security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 30, 2019
- ALAS2-2019-1231 Important: bind security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jul 1, 2019
- ELSA-2019-1294 Important: bind security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 30, 2019