high 7.5

CVE-2018-5740 in the critical feed json

A flaw in the "deny-answer-aliases" feature can cause an assertion failure in named

published 2019-01-16 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-17509

cvss: 7.5; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 60.2%; EPSS 60.2% chance of exploitation in 30 days, percentile 99.1%
public exploits: 0; none known

"deny-answer-aliases" is a little-used feature intended to help recursive server operators protect end users against DNS rebinding attacks, a potential method of circumventing the security model used by client browsers. However, a defect in this feature makes it easy, when the feature is in use, to experience an assertion failure in name.c. Affects BIND 9.7.0->9.8.8, 9.9.0->9.9.13, 9.10.0->9.10.8, 9.11.0->9.11.4, 9.12.0->9.12.2, 9.13.0->9.13.2.

Patch / fix

fixed in 1 distros 6

isc bind 9.8.8, 9.9.13, 9.10.8, 9.11.4, 9.12.2, 9.13.2

debian ubuntu red hat suse opensuse alpine

bind9 Debian 14, Debian 13, Debian 12 1:9.11.4.P1+dfsg-1

debian advisories DEBIAN-CVE-2018-5740

bind9 Ubuntu 14.04 LTS 1:9.9.5.dfsg-3ubuntu0.18
bind9 Ubuntu 16.04 LTS 1:9.10.3.dfsg.P4-8ubuntu1.11
bind9 Ubuntu 18.04 LTS 1:9.11.3+dfsg-1ubuntu1.2

ubuntu advisories UBUNTU-CVE-2018-5740

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_10.1
bind-sdb RHEL 6 32:9.8.2-0.68.rc1.el6_10.1
bind-libs RHEL 6 32:9.8.2-0.68.rc1.el6_10.1
bind-utils RHEL 6 32:9.8.2-0.68.rc1.el6_10.1
bind-chroot RHEL 6 32:9.8.2-0.68.rc1.el6_10.1
bind RHEL 7 32:9.9.4-61.el7_5.1
bind-sdb RHEL 7 32:9.9.4-61.el7_5.1
bind-libs RHEL 7 32:9.9.4-61.el7_5.1

red hat advisories RHSA-2018:2571 RHSA-2018:2570

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

bind openSUSE Leap 15.1, openSUSE Leap 15.0 9.11.2-lp151.11.3.1

opensuse advisories openSUSE-SU-2019:1533-1

bind Alpine 3.24, Alpine 3.23, Alpine 3.22 +14 more 9.12.2_p1-r0
bind Alpine 3.5 9.10.8_p1-r0
bind Alpine 3.7, Alpine 3.6 9.11.4_p1-r0

alpine advisories ALPINE-CVE-2018-5740

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-2018-5740 updated 2026-11-04 cvss 7.5

bind: processing of certain records when "deny-answer-aliases" is in use may trigger an assert leading to a denial of service

Red Hat Enterprise Linux 5 bind97
affected: workaround, no fix planned “Disabling the "deny-answer-aliases" configuration option should prevent exploitation.”
Red Hat Enterprise Linux Client (v. 7) bind 9.9.4-61.el7_5.1, bind-libs 9.9.4-61.el7_5.1, bind-utils 9.9.4-61.el7_5.1, bind-license 9.9.4-61.el7_5.1, bind-libs-lite 9.9.4-61.el7_5.1 Red Hat Enterprise Linux Client Optional (v. 7) bind 9.9.4-61.el7_5.1, bind-sdb 9.9.4-61.el7_5.1, bind-chroot 9.9.4-61.el7_5.1, bind-pkcs11 9.9.4-61.el7_5.1, bind-sdb-chroot 9.9.4-61.el7_5.1, bind-pkcs11-libs 9.9.4-61.el7_5.1, +1 more Red Hat Enterprise Linux ComputeNode (v. 7) bind 9.9.4-61.el7_5.1, bind-libs 9.9.4-61.el7_5.1, bind-utils 9.9.4-61.el7_5.1, bind-license 9.9.4-61.el7_5.1, bind-libs-lite 9.9.4-61.el7_5.1 Red Hat Enterprise Linux ComputeNode Optional (v. 7) bind 9.9.4-61.el7_5.1, bind-sdb 9.9.4-61.el7_5.1, bind-chroot 9.9.4-61.el7_5.1, bind-pkcs11 9.9.4-61.el7_5.1, bind-sdb-chroot 9.9.4-61.el7_5.1, bind-pkcs11-libs 9.9.4-61.el7_5.1, +1 more
fixed: vendor fix “Disabling the "deny-answer-aliases" configuration option should prevent exploitation.” RHSA-2018:2570
Red Hat Enterprise Linux Desktop (v. 6) bind 9.8.2-0.68.rc1.el6_10.1, bind-libs 9.8.2-0.68.rc1.el6_10.1, bind-utils 9.8.2-0.68.rc1.el6_10.1 Red Hat Enterprise Linux Desktop Optional (v. 6) bind 9.8.2-0.68.rc1.el6_10.1, bind-sdb 9.8.2-0.68.rc1.el6_10.1, bind-chroot 9.8.2-0.68.rc1.el6_10.1
fixed: vendor fix “Disabling the "deny-answer-aliases" configuration option should prevent exploitation.” RHSA-2018:2571
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) bind 9.9.4-61.el7_5.1, bind-libs 9.9.4-61.el7_5.1, bind-utils 9.9.4-61.el7_5.1, bind-chroot 9.9.4-61.el7_5.1, bind-pkcs11 9.9.4-61.el7_5.1, bind-license 9.9.4-61.el7_5.1, +3 more Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) bind-sdb 9.9.4-61.el7_5.1, bind-pkcs11 9.9.4-61.el7_5.1, bind-sdb-chroot 9.9.4-61.el7_5.1, bind-pkcs11-libs 9.9.4-61.el7_5.1, bind-pkcs11-utils 9.9.4-61.el7_5.1
fixed: vendor fix “Disabling the "deny-answer-aliases" configuration option should prevent exploitation.” RHSA-2018:2570
Red Hat Enterprise Linux HPC Node (v. 6) bind 9.8.2-0.68.rc1.el6_10.1, bind-libs 9.8.2-0.68.rc1.el6_10.1, bind-utils 9.8.2-0.68.rc1.el6_10.1 Red Hat Enterprise Linux HPC Node Optional (v. 6) bind 9.8.2-0.68.rc1.el6_10.1, bind-sdb 9.8.2-0.68.rc1.el6_10.1, bind-chroot 9.8.2-0.68.rc1.el6_10.1 Red Hat Enterprise Linux Server (v. 6) bind 9.8.2-0.68.rc1.el6_10.1, bind-libs 9.8.2-0.68.rc1.el6_10.1, bind-utils 9.8.2-0.68.rc1.el6_10.1, bind-chroot 9.8.2-0.68.rc1.el6_10.1
fixed: vendor fix “Disabling the "deny-answer-aliases" configuration option should prevent exploitation.” RHSA-2018:2571
Red Hat Enterprise Linux Server (v. 7) bind 9.9.4-61.el7_5.1, bind-libs 9.9.4-61.el7_5.1, bind-utils 9.9.4-61.el7_5.1, bind-chroot 9.9.4-61.el7_5.1, bind-pkcs11 9.9.4-61.el7_5.1, bind-license 9.9.4-61.el7_5.1, +3 more
fixed: vendor fix “Disabling the "deny-answer-aliases" configuration option should prevent exploitation.” RHSA-2018:2570
Red Hat Enterprise Linux Server Optional (v. 6) bind-sdb 9.8.2-0.68.rc1.el6_10.1
fixed: vendor fix “Disabling the "deny-answer-aliases" configuration option should prevent exploitation.” RHSA-2018:2571
Red Hat Enterprise Linux Server Optional (v. 7) bind-sdb 9.9.4-61.el7_5.1, bind-pkcs11 9.9.4-61.el7_5.1, bind-sdb-chroot 9.9.4-61.el7_5.1, bind-pkcs11-libs 9.9.4-61.el7_5.1, bind-pkcs11-utils 9.9.4-61.el7_5.1
fixed: vendor fix “Disabling the "deny-answer-aliases" configuration option should prevent exploitation.” RHSA-2018:2570

show 5 more

Red Hat Enterprise Linux Workstation (v. 6) bind 9.8.2-0.68.rc1.el6_10.1, bind-libs 9.8.2-0.68.rc1.el6_10.1, bind-utils 9.8.2-0.68.rc1.el6_10.1, bind-chroot 9.8.2-0.68.rc1.el6_10.1
fixed: vendor fix “Disabling the "deny-answer-aliases" configuration option should prevent exploitation.” RHSA-2018:2571
Red Hat Enterprise Linux Workstation (v. 7) bind 9.9.4-61.el7_5.1, bind-libs 9.9.4-61.el7_5.1, bind-utils 9.9.4-61.el7_5.1, bind-chroot 9.9.4-61.el7_5.1, bind-pkcs11 9.9.4-61.el7_5.1, bind-license 9.9.4-61.el7_5.1, +3 more
fixed: vendor fix “Disabling the "deny-answer-aliases" configuration option should prevent exploitation.” RHSA-2018:2570
Red Hat Enterprise Linux Workstation Optional (v. 6) bind-sdb 9.8.2-0.68.rc1.el6_10.1
fixed: vendor fix “Disabling the "deny-answer-aliases" configuration option should prevent exploitation.” RHSA-2018:2571
Red Hat Enterprise Linux Workstation Optional (v. 7) bind-sdb 9.9.4-61.el7_5.1, bind-sdb-chroot 9.9.4-61.el7_5.1
fixed: vendor fix “Disabling the "deny-answer-aliases" configuration option should prevent exploitation.” RHSA-2018:2570
Red Hat Enterprise Linux 5 bind Red Hat Enterprise Linux 8 bind, bind-sdb, bind-libs, bind-utils, bind-chroot, bind-pkcs11, +7 more Red Hat Virtualization 4 bind
not affected: vulnerable code not present

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

60.24% chance of exploitation in the next 30 days, higher than 99.1% 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	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

ISC BIND 9

Classification

Weakness

CWE-617 Reachable Assertion

References

access.redhat.com /errata/RHSA-2018:2570
vendor-advisory, third-party-advisory
access.redhat.com /errata/RHSA-2018:2571
vendor-advisory, third-party-advisory
usn.ubuntu.com /3769-2/
vendor-advisory, third-party-advisory
usn.ubuntu.com /3769-1/
vendor-advisory, third-party-advisory
security.gentoo.org /glsa/201903-13
vendor-advisory, third-party-advisory
lists.opensuse.org /opensuse-security-announce/2019-06/msg00027.html
vendor-advisory, mailing-list, third-party-advisory
lists.opensuse.org /opensuse-security-announce/2019-06/msg00026.html
vendor-advisory, mailing-list, third-party-advisory
kb.isc.org /docs/aa-01639
vendor-advisory
securityfocus.com /bid/105055
vdb-entry, third-party-advisory
lists.debian.org /debian-lts-announce/2018/08/msg00033.html
mailing-list, third-party-advisory
securitytracker.com /id/1041436
vdb-entry, third-party-advisory
security.netapp.com /advisory/ntap-20180926-0003/
third-party-advisory
support.hpe.com /hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03927en_us
third-party-advisory
lists.debian.org /debian-lts-announce/2021/11/msg00001.html
mailing-list, third-party-advisory

Sources

CVE List CVE-2018-5740
NVD CVE-2018-5740

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.

Summary