--- title: "CVE-2019-6470\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-2019-6470?format=md keywords: index, follow --- # CVE-2019-6470 Publication date 3 May 2019 Last updated 25 August 2025 --- Ubuntu priority **Medium** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) ## Cvss 3 Severity Score **7.5 · High** [Score breakdown](https://ubuntu.com/security/CVE-2019-6470?format=md#impact-score) Toggle side navigation ## Description There had existed in one of the ISC BIND libraries a bug in a function that was used by dhcpd when operating in DHCPv6 mode. There was also a bug in dhcpd relating to the use of this function per its documentation, but the bug in the library function prevented this from causing any harm. All releases of dhcpd from ISC contain copies of this, and other, BIND libraries in combinations that have been tested prior to release and are known to not present issues like this. Some third-party packagers of ISC software have modified the dhcpd source, BIND source, or version matchup in ways that create the crash potential. Based on reports available to ISC, the crash probability is large and no analysis has been done on how, or even if, the probability can be manipulated by an attacker. Affects: Builds of dhcpd versions prior to version 4.4.1 when using BIND versions 9.11.2 or later, or BIND versions with specific bug fixes backported to them. ISC does not have access to comprehensive version lists for all repackagings of dhcpd that are vulnerable. In particular, builds from other vendors may also be affected. Operators are advised to consult their vendor documentation. [Read the notes from the security team](https://ubuntu.com/security/CVE-2019-6470?format=md#notes) ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | isc-dhcp | 19.04 disco | Not affected | | 18.10 cosmic | Fixed 4.3.5-3ubuntu9.1 | | 18.04 LTS bionic | Fixed 4.3.5-3ubuntu7.1 | | 16.04 LTS xenial | Not affected | | 14.04 LTS trusty | Not affected | --- * [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) * [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses) * [Patch details](https://ubuntu.com/security/CVE-2019-6470?format=md#patch-details) ## Notes --- ### [mdeslaur](https://launchpad.net/~mdeslaur) issue in isc-dhcp was introduced by the following change in bind in bionic+: https://gitlab.isc.org/wpk/bind9/commit/65a483106e45704e19781bfe4f4634db4f77562e ### Patch details For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) | Package | Patch details | | --- | --- | | isc-dhcp | * Upstream: * Upstream: | ## Severity score breakdown CVSS version: CVSS v3.0 **Base score** 7.5 · High * Base metrics | Parameter | Value | | --- | --- | | Attack vector | Network | | Attack complexity | Low | | Privileges required | None | | User interaction | None | | Scope | Unchanged | | Confidentiality impact | None | | Integrity impact | None | | Availability impact | High | * Scores | Parameter | Value | | --- | --- | | Base score | 7.5 · High | | Exploitability score | - | | Impact score | - | **Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-6470) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-6470) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-6470) * [Debian](https://security-tracker.debian.org/tracker/CVE-2019-6470) ### Related Ubuntu Security Notices (USN) + [USN-3973-1](https://usn.ubuntu.com/USN-3973-1) + DHCP vulnerability + 13 May 2019 ### Other references *