CVE-2018-5740

Name: CVE-2018-5740
Creator: NVD / NIST
Published: 2019-01-16T20:29:01.017+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 59.35%

Last modified Jun 17, 2026

CVE-2018-5740 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. "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. EPSS estimates a 59.35% chance of exploitation in the next 30 days.

Description

"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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

59.35%

99.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-617

Affected Software

Vendor	Product	Versions
Isc	Bind	>= 9.7.0, < 9.8.8
Isc	Bind	>= 9.9.0, < 9.9.13
Isc	Bind	>= 9.10.0, < 9.10.8
Isc	Bind	>= 9.11.0, < 9.11.4
Isc	Bind	>= 9.12.0, < 9.12.2
Isc	Bind	>= 9.13.0, < 9.13.2
Redhat	Enterprise Linux Desktop	6.0
Redhat	Enterprise Linux Desktop	7.0
Redhat	Enterprise Linux Server	6.0
Redhat	Enterprise Linux Server	7.0
Redhat	Enterprise Linux Server Aus	7.6
Redhat	Enterprise Linux Server Eus	7.5
Redhat	Enterprise Linux Server Eus	7.6
Redhat	Enterprise Linux Workstation	6.0
Redhat	Enterprise Linux Workstation	7.0
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0
Netapp	Data Ontap Edge	All versions
Canonical	Ubuntu Linux	12.04
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Hp	Hp-Ux	All versions
Opensuse	Leap	15.0
Opensuse	Leap	15.1
Opensuse	Leap	42.3

References

http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00026.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00027.htmlMailing List, Third Party Advisory
http://www.securityfocus.com/bid/105055Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041436Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:2570Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2571Third Party Advisory
https://kb.isc.org/docs/aa-01639Vendor Advisory
https://lists.debian.org/debian-lts-announce/2018/08/msg00033.htmlThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/11/msg00001.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/201903-13Third Party Advisory
https://security.netapp.com/advisory/ntap-20180926-0003/Third Party Advisory
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03927en_usThird Party Advisory
https://usn.ubuntu.com/3769-1/Third Party Advisory
https://usn.ubuntu.com/3769-2/Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00026.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00027.htmlMailing List, Third Party Advisory
http://www.securityfocus.com/bid/105055Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041436Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:2570Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2571Third Party Advisory
https://kb.isc.org/docs/aa-01639Vendor Advisory
https://lists.debian.org/debian-lts-announce/2018/08/msg00033.htmlThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/11/msg00001.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/201903-13Third Party Advisory
https://security.netapp.com/advisory/ntap-20180926-0003/Third Party Advisory
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03927en_usThird Party Advisory
https://usn.ubuntu.com/3769-1/Third Party Advisory
https://usn.ubuntu.com/3769-2/Third Party Advisory

Timeline

Published: Jan 16, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-5740?

How severe is CVE-2018-5740?

CVE-2018-5740 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 59.35% probability of exploitation in the next 30 days.

How do I fix CVE-2018-5740?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-5740?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST