--- title: "CVE-2012-3955\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-2012-3955?format=md keywords: index, follow --- # CVE-2012-3955 Publication date 13 September 2012 Last updated 24 July 2024 --- Ubuntu priority **Medium** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) Toggle side navigation ## Description ISC DHCP 4.1.x before 4.1-ESV-R7 and 4.2.x before 4.2.4-P2 allows remote attackers to cause a denial of service (daemon crash) in opportunistic circumstances by establishing an IPv6 lease in an environment where the lease expiration time is later reduced. [Read the notes from the security team](https://ubuntu.com/security/CVE-2012-3955?format=md#notes) ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | dhcp3 | 12.04 LTS precise | Not in release | | 11.10 oneiric | Not in release | | 11.04 natty | Not in release | | 10.04 LTS lucid | Not affected | | 8.04 LTS hardy | Not affected | | isc-dhcp | 12.04 LTS precise | Fixed 4.1.ESV-R4-0ubuntu5.5 | | 11.10 oneiric | Fixed 4.1.1-P1-17ubuntu10.5 | | 11.04 natty | Fixed 4.1.1-P1-15ubuntu9.6 | | 10.04 LTS lucid | Not in release | | 8.04 LTS hardy | Not in release | --- * [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) * [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses) ## Notes --- ### [mdeslaur](https://launchpad.net/~mdeslaur) no ipv6 support in 3.x ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-3955) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2012-3955) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2012-3955) * [Debian](https://security-tracker.debian.org/tracker/CVE-2012-3955) ### Related Ubuntu Security Notices (USN) + [USN-1571-1](https://usn.ubuntu.com/USN-1571-1) + DHCP vulnerability + 18 September 2012 ### Other references * *