---
title: "CVE-2018-5745\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2018-5745?format=md
keywords: index, follow
---

# CVE-2018-5745

Publication date 21 February 2019

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**4.9 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2018-5745?format=md#impact-score)

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## Description

"managed-keys" is a feature which allows a BIND resolver to automatically
maintain the keys used by trust anchors which operators configure for use
in DNSSEC validation. Due to an error in the managed-keys feature it is
possible for a BIND server which uses managed-keys to exit due to an
assertion failure if, during key rollover, a trust anchor's keys are
replaced with keys which use an unsupported algorithm. Versions affected:
BIND 9.9.0 -> 9.10.8-P1, 9.11.0 -> 9.11.5-P1, 9.12.0 -> 9.12.3-P1, and
versions 9.9.3-S1 -> 9.11.5-S3 of BIND 9 Supported Preview Edition.
Versions 9.13.0 -> 9.13.6 of the 9.13 development branch are also affected.
Versions prior to BIND 9.9.0 have not been evaluated for vulnerability to
CVE-2018-5745.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| bind9 | 18.10 cosmic | Fixed 1:9.11.4+dfsg-3ubuntu5.1 |
| 18.04 LTS bionic | Fixed 1:9.11.3+dfsg-1ubuntu1.5 |
| 16.04 LTS xenial | Fixed 1:9.10.3.dfsg.P4-8ubuntu1.12 |
| 14.04 LTS trusty | Fixed 1:9.9.5.dfsg-3ubuntu0.19 |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

4.9 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | High |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | None |
  | Integrity impact | None |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 4.9 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-5745)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2018-5745)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2018-5745)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2018-5745)

### Related Ubuntu Security Notices (USN)

+ [USN-3893-1](https://usn.ubuntu.com/USN-3893-1)
+ Bind vulnerabilities
+ 22 February 2019

+ [USN-3893-2](https://usn.ubuntu.com/USN-3893-2)
+ Bind vulnerabilities
+ 25 February 2019

### Other references

* <https://kb.isc.org/docs/cve-2018-5745>
* <https://www.cve.org/CVERecord?id=CVE-2018-5745>