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Fencer Vulns
high 7.5

CVE-2018-5743 json

Limiting simultaneous TCP clients was ineffective

published 2019-10-09 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-17512

cvss
7.5
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
6.4%
EPSS 6.4% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

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.

Patch / fix

  • bind9 Debian 14, Debian 13, Debian 12 1:9.11.5.P4+dfsg-4

debian advisories DEBIAN-CVE-2018-5743

  • bind9 Ubuntu 16.04 LTS 1:9.10.3.dfsg.P4-8ubuntu1.14
  • bind9 Ubuntu 18.04 LTS 1:9.11.3+dfsg-1ubuntu1.7
  • bind9 Ubuntu Pro 14.04 LTS 1:9.9.5.dfsg-3ubuntu0.19+esm1

ubuntu advisories UBUNTU-CVE-2018-5743

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • bind RHEL 6 32:9.8.2-0.68.rc1.el6_10.3
  • bind-sdb RHEL 6 32:9.8.2-0.68.rc1.el6_10.3
  • bind-libs RHEL 6 32:9.8.2-0.68.rc1.el6_10.3
  • bind-utils RHEL 6 32:9.8.2-0.68.rc1.el6_10.3
  • bind-chroot RHEL 6 32:9.8.2-0.68.rc1.el6_10.3
  • bind RHEL 8 32:9.11.4-17.P2.el8_0
  • bind-sdb RHEL 8 32:9.11.4-17.P2.el8_0
  • bind-libs RHEL 8 32:9.11.4-17.P2.el8_0

red hat advisories RHSA-2019:2977RHSA-2019:2698RHSA-2019:1492RHSA-2019:1145RHSA-2019:1294

  • bind SLES for SAP 12 SP4, SLES 12 SP4, SLED 12 SP4 +1 more 9.11.2-3.10.1
  • bind SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 9.9.6P1-0.51.15.4
  • bind SLE Module for Server Applications 15 SP1, SLE Module for Server Applications 15, SLE Module for Basesystem 15 SP1 +1 more 9.11.2-12.11.2
  • bind SLES 12-LTSS 9.9.9P1-28.42.1

suse advisories SUSE-SU-2019:2502-1SUSE-SU-2019:1449-1SUSE-SU-2019:14074-1SUSE-SU-2019:1407-1

  • bind openSUSE Tumbleweed 9.16.20-1.4
  • bind openSUSE Leap 15.1, openSUSE Leap 15.0 9.11.2-lp151.11.3.1

opensuse advisories openSUSE-SU-2024:10650-1openSUSE-SU-2019:1533-1

  • bind Alpine 3.24, Alpine 3.23, Alpine 3.22 +12 more 9.14.1-r0
  • bind Alpine 3.7, Alpine 3.6 9.11.6_p1-r0
  • bind Alpine 3.9, Alpine 3.8 9.12.4_p1-r0

alpine advisories ALPINE-CVE-2018-5743

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-5743 updated cvss 8.6

bind: Limiting simultaneous TCP clients is ineffective

  • Red Hat Enterprise Linux 5 bind, bind97
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) bind 9.11.4-17.P2.el8_0, bind-sdb 9.11.4-17.P2.el8_0, bind-libs 9.11.4-17.P2.el8_0, bind-utils 9.11.4-17.P2.el8_0, bind-chroot 9.11.4-17.P2.el8_0, bind-pkcs11 9.11.4-17.P2.el8_0, +6 more Red Hat Enterprise Linux BaseOS (v. 8) bind 9.11.4-17.P2.el8_0, bind-export-libs 9.11.4-17.P2.el8_0
    fixed: vendor fix RHSA-2019:1145
  • Red Hat Enterprise Linux Client (v. 7) bind 9.9.4-74.el7_6.1, bind-libs 9.9.4-74.el7_6.1, bind-utils 9.9.4-74.el7_6.1, bind-license 9.9.4-74.el7_6.1, bind-libs-lite 9.9.4-74.el7_6.1 Red Hat Enterprise Linux Client Optional (v. 7) bind 9.9.4-74.el7_6.1, bind-sdb 9.9.4-74.el7_6.1, bind-chroot 9.9.4-74.el7_6.1, bind-pkcs11 9.9.4-74.el7_6.1, bind-sdb-chroot 9.9.4-74.el7_6.1, bind-pkcs11-libs 9.9.4-74.el7_6.1, +1 more Red Hat Enterprise Linux ComputeNode (v. 7) bind 9.9.4-74.el7_6.1, bind-libs 9.9.4-74.el7_6.1, bind-utils 9.9.4-74.el7_6.1, bind-license 9.9.4-74.el7_6.1, bind-libs-lite 9.9.4-74.el7_6.1
    fixed: vendor fix RHSA-2019:1294
  • Red Hat Enterprise Linux ComputeNode EUS (v. 7.4) bind 9.9.4-51.el7_4.3, bind-libs 9.9.4-51.el7_4.3, bind-utils 9.9.4-51.el7_4.3, bind-license 9.9.4-51.el7_4.3, bind-libs-lite 9.9.4-51.el7_4.3
    fixed: vendor fix RHSA-2019:2698
  • Red Hat Enterprise Linux ComputeNode EUS (v. 7.5) bind 9.9.4-61.el7_5.2, bind-libs 9.9.4-61.el7_5.2, bind-utils 9.9.4-61.el7_5.2, bind-license 9.9.4-61.el7_5.2, bind-libs-lite 9.9.4-61.el7_5.2
    fixed: vendor fix RHSA-2019:2977
  • Red Hat Enterprise Linux ComputeNode Optional (v. 7) bind 9.9.4-74.el7_6.1, bind-sdb 9.9.4-74.el7_6.1, bind-chroot 9.9.4-74.el7_6.1, bind-pkcs11 9.9.4-74.el7_6.1, bind-sdb-chroot 9.9.4-74.el7_6.1, bind-pkcs11-libs 9.9.4-74.el7_6.1, +1 more
    fixed: vendor fix RHSA-2019:1294
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4) bind 9.9.4-51.el7_4.3, bind-sdb 9.9.4-51.el7_4.3, bind-chroot 9.9.4-51.el7_4.3, bind-pkcs11 9.9.4-51.el7_4.3, bind-sdb-chroot 9.9.4-51.el7_4.3, bind-pkcs11-libs 9.9.4-51.el7_4.3, +1 more
    fixed: vendor fix RHSA-2019:2698
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5) bind 9.9.4-61.el7_5.2, bind-sdb 9.9.4-61.el7_5.2, bind-chroot 9.9.4-61.el7_5.2, bind-pkcs11 9.9.4-61.el7_5.2, bind-sdb-chroot 9.9.4-61.el7_5.2, bind-pkcs11-libs 9.9.4-61.el7_5.2, +1 more
    fixed: vendor fix RHSA-2019:2977
show 14 more
  • Red Hat Enterprise Linux Desktop (v. 6) bind 9.8.2-0.68.rc1.el6_10.3, bind-libs 9.8.2-0.68.rc1.el6_10.3, bind-utils 9.8.2-0.68.rc1.el6_10.3 Red Hat Enterprise Linux Desktop Optional (v. 6) bind 9.8.2-0.68.rc1.el6_10.3, bind-sdb 9.8.2-0.68.rc1.el6_10.3, bind-chroot 9.8.2-0.68.rc1.el6_10.3
    fixed: vendor fix RHSA-2019:1492
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) bind 9.9.4-74.el7_6.1, bind-libs 9.9.4-74.el7_6.1, bind-utils 9.9.4-74.el7_6.1, bind-chroot 9.9.4-74.el7_6.1, bind-pkcs11 9.9.4-74.el7_6.1, bind-license 9.9.4-74.el7_6.1, +3 more Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) bind-sdb 9.9.4-74.el7_6.1, bind-pkcs11 9.9.4-74.el7_6.1, bind-sdb-chroot 9.9.4-74.el7_6.1, bind-pkcs11-libs 9.9.4-74.el7_6.1, bind-pkcs11-utils 9.9.4-74.el7_6.1
    fixed: vendor fix RHSA-2019:1294
  • Red Hat Enterprise Linux HPC Node (v. 6) bind 9.8.2-0.68.rc1.el6_10.3, bind-libs 9.8.2-0.68.rc1.el6_10.3, bind-utils 9.8.2-0.68.rc1.el6_10.3 Red Hat Enterprise Linux HPC Node Optional (v. 6) bind 9.8.2-0.68.rc1.el6_10.3, bind-sdb 9.8.2-0.68.rc1.el6_10.3, bind-chroot 9.8.2-0.68.rc1.el6_10.3 Red Hat Enterprise Linux Server (v. 6) bind 9.8.2-0.68.rc1.el6_10.3, bind-libs 9.8.2-0.68.rc1.el6_10.3, bind-utils 9.8.2-0.68.rc1.el6_10.3, bind-chroot 9.8.2-0.68.rc1.el6_10.3
    fixed: vendor fix RHSA-2019:1492
  • Red Hat Enterprise Linux Server (v. 7) bind 9.9.4-74.el7_6.1, bind-libs 9.9.4-74.el7_6.1, bind-utils 9.9.4-74.el7_6.1, bind-chroot 9.9.4-74.el7_6.1, bind-pkcs11 9.9.4-74.el7_6.1, bind-license 9.9.4-74.el7_6.1, +3 more
    fixed: vendor fix RHSA-2019:1294
  • Red Hat Enterprise Linux Server EUS (v. 7.4) bind 9.9.4-51.el7_4.3, bind-libs 9.9.4-51.el7_4.3, bind-utils 9.9.4-51.el7_4.3, bind-chroot 9.9.4-51.el7_4.3, bind-pkcs11 9.9.4-51.el7_4.3, bind-license 9.9.4-51.el7_4.3, +3 more
    fixed: vendor fix RHSA-2019:2698
  • Red Hat Enterprise Linux Server EUS (v. 7.5) bind 9.9.4-61.el7_5.2, bind-libs 9.9.4-61.el7_5.2, bind-utils 9.9.4-61.el7_5.2, bind-chroot 9.9.4-61.el7_5.2, bind-pkcs11 9.9.4-61.el7_5.2, bind-license 9.9.4-61.el7_5.2, +3 more
    fixed: vendor fix RHSA-2019:2977
  • Red Hat Enterprise Linux Server Optional (v. 6) bind-sdb 9.8.2-0.68.rc1.el6_10.3
    fixed: vendor fix RHSA-2019:1492
  • Red Hat Enterprise Linux Server Optional (v. 7) bind-sdb 9.9.4-74.el7_6.1, bind-pkcs11 9.9.4-74.el7_6.1, bind-sdb-chroot 9.9.4-74.el7_6.1, bind-pkcs11-libs 9.9.4-74.el7_6.1, bind-pkcs11-utils 9.9.4-74.el7_6.1
    fixed: vendor fix RHSA-2019:1294
  • Red Hat Enterprise Linux Server Optional EUS (v. 7.4) bind-sdb 9.9.4-51.el7_4.3, bind-pkcs11 9.9.4-51.el7_4.3, bind-sdb-chroot 9.9.4-51.el7_4.3, bind-pkcs11-libs 9.9.4-51.el7_4.3, bind-pkcs11-utils 9.9.4-51.el7_4.3
    fixed: vendor fix RHSA-2019:2698
  • Red Hat Enterprise Linux Server Optional EUS (v. 7.5) bind-sdb 9.9.4-61.el7_5.2, bind-pkcs11 9.9.4-61.el7_5.2, bind-sdb-chroot 9.9.4-61.el7_5.2, bind-pkcs11-libs 9.9.4-61.el7_5.2, bind-pkcs11-utils 9.9.4-61.el7_5.2
    fixed: vendor fix RHSA-2019:2977
  • Red Hat Enterprise Linux Workstation (v. 6) bind 9.8.2-0.68.rc1.el6_10.3, bind-libs 9.8.2-0.68.rc1.el6_10.3, bind-utils 9.8.2-0.68.rc1.el6_10.3, bind-chroot 9.8.2-0.68.rc1.el6_10.3
    fixed: vendor fix RHSA-2019:1492
  • Red Hat Enterprise Linux Workstation (v. 7) bind 9.9.4-74.el7_6.1, bind-libs 9.9.4-74.el7_6.1, bind-utils 9.9.4-74.el7_6.1, bind-chroot 9.9.4-74.el7_6.1, bind-pkcs11 9.9.4-74.el7_6.1, bind-license 9.9.4-74.el7_6.1, +3 more
    fixed: vendor fix RHSA-2019:1294
  • Red Hat Enterprise Linux Workstation Optional (v. 6) bind-sdb 9.8.2-0.68.rc1.el6_10.3
    fixed: vendor fix RHSA-2019:1492
  • Red Hat Enterprise Linux Workstation Optional (v. 7) bind-sdb 9.9.4-74.el7_6.1, bind-sdb-chroot 9.9.4-74.el7_6.1
    fixed: vendor fix RHSA-2019:1294

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

6.43% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Affected products

  • ISC BIND 9

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.