HOME VULNERABILITIESCVE-2018-5740

HIGH

CVE-2018-5740

CWE-617Published: January 16, 2019· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official 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.

Technical Analysis

CVE-2018-5740 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Affected Vendors & Products

Canonical1 product(s)

ubuntu linux

Debian1 product(s)

debian linux

HP1 product(s)

hp-ux

isc1 product(s)

bind

netapp1 product(s)

data ontap edge

openSUSE1 product(s)

leap

Red Hat5 product(s)

enterprise linux desktopenterprise linux serverenterprise linux server ausenterprise linux server eusenterprise linux workstation

Source: NVD CPE · 21 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-06/msg00026.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-06/msg00027.html

ADVISORYhttp://www.securityfocus.com/bid/105055

ADVISORYhttp://www.securitytracker.com/id/1041436

ADVISORYhttps://access.redhat.com/errata/RHSA-2018:2570

ADVISORYhttps://access.redhat.com/errata/RHSA-2018:2571

ADVISORYhttps://kb.isc.org/docs/aa-01639

ADVISORYhttps://lists.debian.org/debian-lts-announce/2018/08/msg00033.html

ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/11/msg00001.html

ADVISORYhttps://security.gentoo.org/glsa/201903-13

ADVISORYhttps://security.netapp.com/advisory/ntap-20180926-0003/

ADVISORYhttps://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03927en_us

ADVISORYhttps://usn.ubuntu.com/3769-1/

ADVISORYhttps://usn.ubuntu.com/3769-2/

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-06/msg00026.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-06/msg00027.html

ADVISORYhttp://www.securityfocus.com/bid/105055

ADVISORYhttp://www.securitytracker.com/id/1041436

ADVISORYhttps://access.redhat.com/errata/RHSA-2018:2570

ADVISORYhttps://access.redhat.com/errata/RHSA-2018:2571

ADVISORYhttps://kb.isc.org/docs/aa-01639

ADVISORYhttps://lists.debian.org/debian-lts-announce/2018/08/msg00033.html

ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/11/msg00001.html

ADVISORYhttps://security.gentoo.org/glsa/201903-13

ADVISORYhttps://security.netapp.com/advisory/ntap-20180926-0003/

ADVISORYhttps://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03927en_us

ADVISORYhttps://usn.ubuntu.com/3769-1/

ADVISORYhttps://usn.ubuntu.com/3769-2/

All References (28)

→

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

Quick Facts

CVE IDCVE-2018-5740

CVSS Score7.5 / 10

SeverityHIGH

WeaknessCWE-617

CISA KEVNo

Affected7 vendor(s)

PublishedJan 16, 2019

Related CVEs (CWE-617)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2018-5740 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.

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