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NVD / CVE Program· CNA isc

CVE-2018-5740: A flaw in the "deny-answer-aliases" feature can cause an assertion failure in named

HighCVSS 7.5 · v3.1—Proof of concept Fix available

Noroxi assessment

Priority: Plan (action score 48/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 60.2% (FIRST EPSS); higher than 99.1% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: bind (Alpine:v3.10) 9.12.2_p1-r0; bind (Alpine:v3.5) 9.10.8_p1-r0; bind (Alpine:v3.6) 9.11.4_p1-r0.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Add it to your regular patch cycle. Upgrade to bind (Alpine:v3.10) 9.12.2_p1-r0; bind (Alpine:v3.5) 9.10.8_p1-r0; bind (Alpine:v3.6) 9.11.4_p1-r0 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

"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.

Published
Jan 16, 2019
Updated
Jun 16, 2026
EPSS
60.2% · 99th percentile

Report tools

JSON

Action score

48

Plan

Add it to your regular patch cycle.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
18 / 30 · 60.2%

CNA vs NVD score

NVD
7.5
CNA · isc
7.5
agree

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
iscbind
redhatenterprise linux desktop
redhatenterprise linux server
redhatenterprise linux server aus
redhatenterprise linux server eus
redhatenterprise linux workstation
debiandebian linux
netappdata ontap edge
canonicalubuntu linux
hphp-ux
opensuseleap

Versions reported by the vendor

Affected version ranges reported by the assigning authority (isc). Independent of NVD's CPE analysis and usually ahead of it.

  • ISC BIND 9

    • BIND 9 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->9.13.2affected
Affected versions · NVD (20)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • canonical ubuntu linux12.04
  • canonical ubuntu linux14.04
  • canonical ubuntu linux16.04
  • canonical ubuntu linux18.04
  • debian debian linux8.0
  • debian debian linux9.0
  • hp hp-uxall versions
  • isc bind9.9.0 and later · before 9.9.13
  • isc bind9.11.0 and later · before 9.11.4
  • isc bind9.10.0 and later · before 9.10.8
  • isc bind9.7.0 and later · before 9.8.8
  • isc bind9.13.0 and later · before 9.13.2
  • isc bind9.12.0 and later · before 9.12.2
  • netapp data ontap edgeall versions
  • opensuse leap15.0
  • opensuse leap15.1
  • opensuse leap42.3
  • redhat enterprise linux desktop6.0
  • redhat enterprise linux desktop7.0
  • redhat enterprise linux server6.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.10bindfrom 9.7.0 · before 9.12.2_p1-r09.12.2_p1-r0
Alpine:v3.5bindfrom 9.7.0 · before 9.10.8_p1-r09.10.8_p1-r0
Alpine:v3.6bindfrom 9.7.0 · before 9.11.4_p1-r09.11.4_p1-r0
Debian:12bind9before 1:9.11.4.P1+dfsg-11:9.11.4.P1+dfsg-1
Debian:8bind9before 1:9.9.5.dfsg-9+deb8u161:9.9.5.dfsg-9+deb8u16
Debian:9bind9before 1:9.10.3.dfsg.P4-12.3+deb9u101:9.10.3.dfsg.P4-12.3+deb9u10
openSUSE:Leap 15.0bindbefore 9.11.2-lp151.11.3.19.11.2-lp151.11.3.1
Red Hat:enterprise_linux:6::clientbindbefore 32:9.8.2-0.68.rc1.el6_10.132:9.8.2-0.68.rc1.el6_10.1
Red Hat:enterprise_linux:6::clientbind-chrootbefore 32:9.8.2-0.68.rc1.el6_10.132:9.8.2-0.68.rc1.el6_10.1
Red Hat:enterprise_linux:6::clientbind-debuginfobefore 32:9.8.2-0.68.rc1.el6_10.132:9.8.2-0.68.rc1.el6_10.1
Red Hat:enterprise_linux:6::clientbind-develbefore 32:9.8.2-0.68.rc1.el6_10.132:9.8.2-0.68.rc1.el6_10.1
Red Hat:enterprise_linux:6::clientbind-libsbefore 32:9.8.2-0.68.rc1.el6_10.132:9.8.2-0.68.rc1.el6_10.1
Red Hat:enterprise_linux:6::clientbind-sdbbefore 32:9.8.2-0.68.rc1.el6_10.132:9.8.2-0.68.rc1.el6_10.1
Red Hat:enterprise_linux:6::clientbind-utilsbefore 32:9.8.2-0.68.rc1.el6_10.132:9.8.2-0.68.rc1.el6_10.1
Red Hat:enterprise_linux:7::clientbindbefore 32:9.9.4-61.el7_5.132:9.9.4-61.el7_5.1
Red Hat:enterprise_linux:7::clientbind-chrootbefore 32:9.9.4-61.el7_5.132:9.9.4-61.el7_5.1
Red Hat:enterprise_linux:7::clientbind-debuginfobefore 32:9.9.4-61.el7_5.132:9.9.4-61.el7_5.1
Red Hat:enterprise_linux:7::clientbind-develbefore 32:9.9.4-61.el7_5.132:9.9.4-61.el7_5.1
Red Hat:enterprise_linux:7::clientbind-libsbefore 32:9.9.4-61.el7_5.132:9.9.4-61.el7_5.1
Red Hat:enterprise_linux:7::clientbind-libs-litebefore 32:9.9.4-61.el7_5.132:9.9.4-61.el7_5.1
Red Hat:enterprise_linux:7::clientbind-licensebefore 32:9.9.4-61.el7_5.132:9.9.4-61.el7_5.1
Red Hat:enterprise_linux:7::clientbind-lite-develbefore 32:9.9.4-61.el7_5.132:9.9.4-61.el7_5.1
Red Hat:enterprise_linux:7::clientbind-pkcs11before 32:9.9.4-61.el7_5.132:9.9.4-61.el7_5.1
Red Hat:enterprise_linux:7::clientbind-pkcs11-develbefore 32:9.9.4-61.el7_5.132:9.9.4-61.el7_5.1

+9

Same product

isc: all records

Other highest-scoring records for the same primary product.

  • CVE-2015-5477named in ISC BIND 9.x before 9.9.7-P2 and 9.10.x before 9.10.2-P3 allows remote attackers to cause a denial of service (REQUIRE assertion…KEV
    90Now
  • CVE-2020-8617A logic error in code which checks TSIG validity can be used to trigger an assertion failure in tsig.c
    60This week
  • CVE-2016-2776buffer.c in named in ISC BIND 9 before 9.9.9-P3, 9.10.x before 9.10.4-P3, and 9.11.x before 9.11.0rc3 does not properly construct…
    60This week

Published before and after this one in the same product

  • ← EarlierCVE-2018-5737Jan 16, 2019 · BIND 9.12's serve-stale implementation can cause an assertion failure in rbtdb.c or other undesirable behavior, even if serve-stale is not enabled.
    33Monitor
  • ← EarlierCVE-2018-5738Jan 16, 2019 · Some versions of BIND can improperly permit recursive query service to unauthorized clients
    33Monitor
  • Later →CVE-2018-5741Jan 16, 2019 · Update policies krb5-subdomain and ms-subdomain do not enforce controls promised in their documentation
    27Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:bind9.12.2_p1-r0 · Alpine:v3.10Package registry (OSV)
debian:bind91:9.11.4.P1+dfsg-1 · Debian:12Package registry (OSV)
opensuse:bind9.11.2-lp151.11.3.1 · openSUSE:Leap 15.0Package registry (OSV)
red hat:bind32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:bind-chroot32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:bind-debuginfo32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:bind-devel32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:bind-libs32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:bind-libs-lite32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:bind-license32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:bind-lite-devel32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:bind-pkcs1132:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:bind-pkcs11-devel32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:bind-pkcs11-libs32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:bind-utils32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
suse:bind9.11.2-12.11.2 · SUSE:Linux Enterprise Module for Basesystem 15Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:32018-08-15

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-155 d
  2. Published
  3. TodayNov 14, 2026+2858 d

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-617 · Reachable Assertion

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (13 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records