--- title: "CVE-2018-5740: A flaw in the \"deny-answer-aliases\"… | CubePath" description: "\"deny-answer-aliases\" is a little-used feature intended to help recursive server operators protect end users against DNS rebinding attacks, a potential…" language: en source: https://cubepath.com/security/cve/CVE-2018-5740 --- # CVE-2018-5740: A flaw in the "deny-answer-aliases"… | CubePath ## 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. Official description from the CVE record, published by isc. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2018-5740) ## Key data ### CVSS 3.0 High 7.5 Score published by isc in the CVE record. CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | Metric | Value | What it means | | ---------------------- | --------- | ----------------------------------------------------------------------------------- | | Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. | | Attack complexity | Low | No special conditions are needed. The attack can be repeated at will. | | Privileges required | None | No account or privileges are needed. | | User interaction | None | No action from any user is needed. | | Scope | Unchanged | The impact stays within the vulnerable component. | | Confidentiality impact | None | No effect on the secrecy of data. | | Integrity impact | None | No effect on the trustworthiness of data. | | Availability impact | High | Serious or total effect on availability. | CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) . ### EPSS Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days. Score 0.60236 (60.2% probability) Percentile 99.1% Scores of Nov 10, 2026 Model v2026.06.15 ## Affected products Products listed in the CVE record, as the CNA published them. - ISC BIND 9 - affected: 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->9.13.2 ## References Links listed in the CVE record. They lead to other sites, which CubePath does not control. - [105055](http://www.securityfocus.com/bid/105055) (securityfocus.com) vdb-entry - [\[debian-lts-announce\] 20180830 \[SECURITY\] \[DLA 1485-1\] bind9 security update](https://lists.debian.org/debian-lts-announce/2018/08/msg00033.html) (lists.debian.org) mailing-list - [RHSA-2018:2570](https://access.redhat.com/errata/RHSA-2018:2570) (access.redhat.com) vendor-advisory - [RHSA-2018:2571](https://access.redhat.com/errata/RHSA-2018:2571) (access.redhat.com) vendor-advisory - [USN-3769-2](https://usn.ubuntu.com/3769-2/) (usn.ubuntu.com) vendor-advisory - [1041436](http://www.securitytracker.com/id/1041436) (securitytracker.com) vdb-entry - [security.netapp.com/advisory/ntap-20180926-0003](https://security.netapp.com/advisory/ntap-20180926-0003/) - [kb.isc.org/docs/aa-01639](https://kb.isc.org/docs/aa-01639) - [USN-3769-1](https://usn.ubuntu.com/3769-1/) (usn.ubuntu.com) vendor-advisory - [GLSA-201903-13](https://security.gentoo.org/glsa/201903-13) (security.gentoo.org) vendor-advisory - [openSUSE-SU-2019:1533](http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00027.html) (lists.opensuse.org) vendor-advisory - [openSUSE-SU-2019:1532](http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00026.html) (lists.opensuse.org) vendor-advisory - [support.hpe.com/hpsc/doc/public/display?docLocale=en\_US&doc…](https://support.hpe.com/hpsc/doc/public/display?docLocale=en%5FUS&docId=emr%5Fna-hpesbux03927en%5Fus) - [\[debian-lts-announce\] 20211102 \[SECURITY\] \[DLA 2807-1\] bind9 security update](https://lists.debian.org/debian-lts-announce/2021/11/msg00001.html) (lists.debian.org) mailing-list ## Timeline 1. ID reserved Jan 17, 2018 2. Record published Jan 16, 2019 3. Record last updated Sep 16, 2024 ## Look up another CVE ## About CubePath CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection. [Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection) Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:59 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)